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

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My Miele pearl is at least 15 years old, still a beast. I don't use it that much any more because I have a Roomba now and it cleans every day wonderfully and I only break out the canister occasionally now for corners and cobwebs and such.
We just got the Miele c3 complete care and it’s great. It doesn’t have a power head but we wouldnt use that on our area rugs anyways (it has an air powered spinning brush head if you wanted to use that)…the suction is really powerful, and picks up dog hair super easy.
Personally I'm not usually a fan of turbo heads but as far as they go, the turboteq that miele has is definitely my favorite. Is there any chance there's a vacuum store near you where you could go try one out?
If you can find a used Miele canister, I have had mine coming up on 20 years and it's still amazing. They're pricy, but it's a buy once, cry once kind of thing.
Everyone I know who has ripped through cheap vacs and finally settled on a Miele wishes they had just bought the Miele to begin with. I have had mine for 20 years and love it as much now as I did when I bought it. I get not wanting to spend big bucks on something that you might not use for its intended lifetime (not saying you're old, but the Miele could last 4 decades) but, since you mentioned a grandson, you must have a son or daughter you could hand it down to :)
My 30-year old middle-tier Miele still blows any Shark out of the water. Have had the C Total Home Care for 10, and it’s like new.
I have some miele, not sure if the same model as you. And the best thing about it is that it has 12m cable. Way longer than my previous philips, I just plug it into wall in kitchen a vacuum whole floor in all rooms. Same with second level. So much nicer than having to move to a different wall socket 3 times per floor.

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