
SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

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The D1 comes with the turbo floor head which is a very good air-powered tool for low and med pile carpets. The issue with that floor head on hard wood is that it's not great for the floor itself, the bristles are needed for carpets only, it will snowplough any larger debris, and hair will get tangled up. What you'll need is to purchase the premium parquet head (7200GS) and remove the front bristles from it. IMHO it is the best floor head in the market and the best tool for the job at hand.
You're sorted for life mate. Enjoy your purchase. Just remember to remove the front bristles: https://youtu.be/lJygBd0-ahk (skip to 50 seconds). Cordless and bots are good secondary and tertiary vacs as supplemental for pure convenience. Your D1 is for proper cleans.
It'll clean better as there'll be more airflow sucking up dust and debris before you even reach it. With the bristles in, it'll be a bit of a standard experience of ocassional snowploughing and having to cover all the surface area. Nothing particularly wrong either way. Just a convenience thing.
Look at seboshop.co.uk for refurbs, worth calling as well in case they have something that's not yet online. You could also take a shot at eBay refurbs, some vac repair shops recondition them. Miele and Sebo are the best brands on the market. You'll want to look for corded and bagged.
I have the D4. The d4 has the power head. As long as your D1 is mostly for hard floors, as opposed to say wall to wall carpeting, it’s about as good as it gets. It has four castors and the hose rotates 320 degrees so it’s actually extremely easy to move around/use. Get the premium parquet attachment and remove the front strip on it (don’t throw it away though). It’s BIFL vacuum for sure.
The SEBO will be light years ahead of the Dyson. Just start with the SEBO.
The Dyson, the shark and the roomba don’t compare to the Sebo. That’s how they compare. It’s like asking how a goldfish compares to a great white shark. I guess they both live in the water.
I love my Roomba, but it will never replace a quality vacuum. Keep the Sebo for the love of god, and buy the robot vac later. Also, unless you absolutely \*\*NEED\*\* the mopping feature, just get a unit that has the “basics” like LiDAR mapping and a clean base (bagged if you care about allergies)
Cordless stick vacuums are all more or less disposable, even the expensive ones. The designs are updated frequently and are not made to be repaired, even if you’re able to find parts. I have a Makita cordless which should last a while for quick jobs, but it’s not very powerful. My home vacuum is a 15 year old Miele Swing H1 stick vacuum. It’s corded, but light and powerful, and the bags make everything so much cleaner and more convenient. Personally, I find the cord less annoying than charging. My parents’ heavily used Sebo Airbelt D1 canister vacuum is around 20 years old. Both work perfectly. If I were in the market for a new vacuum, I would buy a Sebo as they are super durable, easily repaired, and very well designed. If I were on a budget, I’d purchase a used Miele. If you want something older, vintage Electrolux vacuums are great once the inevitable deferred maintenance is taken care of. We have a canister vacuum from the seventies at one house and an upright from the nineties at another, both of which are going strong, and both of which have bags and many spare parts readily available.
Having now had both (our White Pearl Miele croaked when it got used during home renovation and got into a pile of unauthorized sheetrock dust), I will say the Sebo is lighter, leaves fewer marks on the walls (I got the Airbelt D1 and use it every day), and (I have been told) performs better in the event it too inadvertently encounters unauthorized sheetrock dust. Both are German-made, and both brands do come with nice warranties... better warranties than other vacuums on the market. Plus they can be repaired. A friend told me she was supposed to throw away her Dyson if it broke, because even if it could be repaired, the cost would likely exceed the value of the vacuum.
Keep the Sebo and get the roborock. The robo will run daily and clean the house with the sebo weekly. If you HAD to pick one, keep the sebo The sebo will last 10x than the roborock. With the robo, you are only getting convenience, but at the cost of longevity and quality and versatility

SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

Numatic International
Henry Canister Series
Budget king, super durable, but heavy and poor on carpets.

SEBO
AIRBELT D4 Premium
Durable, powerful, long cord, but heavy and pricey.

SEBO
FELIX Premium
Durable, powerful, good for allergies, but heavy with awkward attachments.

Miele
Classic C1 Cat & Dog PowerLine
Durable, powerful, quiet, but very expensive, short cord.

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
Numatic International - Henry Canister Series

Ranked #1
Dyson - V15 Detect Series