
Flexispot
E7 Pro
Affordable and stable, but assembly can be confusing.

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2nd this. I just bought 2 L-shaped from Flexispot and very impressed with the build quality and materials.
At places like Flexispot and Uplift, you can always purchase the L frame and then get two of their 30" depth desktops separately, you would just need to drill your own pilot holes. If you are ok with at least one side being 30" deep, Uplift's is 30" deep on the main side and 27.5" on the return side. If you want 30" depth on both sides with no extra drilling, Progressive Desk's L desk has some size combinations with 30" depth on both sides. If you aren't happy with any of those, you can also try getting the frame from wherever you want and then getting a local woodworker to make the desktop to your exact specs.
I had some good responses with Deskhaus, Flexispot, and Uplift. Didn't really contact anybody else.
Personally I think it would be worth it but Flexispot is a good cheaper choice.
This is how I got mine. Sold my old (not height adjustable) desks for the pair and spent an additional 100 to buy a secondhand flexispot. It really was a steal and too some patience and searching to find. Dual motor is a must in my opinion, as are at least 2 programmable buttons. If it is for home use, don’t bother too much with it being too noisy or quiet
I got a Flexispot on a Black Friday sale and saved about a hundred, honestly pretty sturdy depending on how detail oriented and handy you are with assembly. There's one through Costco that doesn't look half bad that has a glass top, USB-A X1 + USB-C X2 integrated charging ports on the side, and drawer. Though I prefer a wooden top to secure a multi-monitor mount and install cable management.
Check how many leg segments it has. My FkexiSpot desk has 2 and low is just a tad not low enough
I had one of the Ikea ones when they first started doing them maybe a decade ago. It was OK but I found I left it down a lot of the time and if I was standing I wasn't standing in a great posture anyway. Biggest thing was that it had no memory so it was always a bit of a faff going from one to the other and tweaking it up and down a bit to get it right. Ended up in the kids room. Due to change rooms around again at home so I'm tempted to try a Flexispot (with position memory this time). I found it was good for the afternoon lull you sometimes get although my WFH routine rarely has me sitting for hours at a time, I have a wireless headset and wander about if it's a long call, or nip downstairs to make a drink through the day.

Flexispot
E7 Pro
Affordable and stable, but assembly can be confusing.

Uplift Desk
2-Leg V2 Standing Desk
Durable, stable, but expensive with poor cable management.

Dezctop
Bifrost Series
Modular design with great cable management, but pricey accessories.

Flexispot
E7 Plus Max
Very stable and durable, but assembly and cable management are tricky.

Secretlab
MAGNUS Pro
Excellent magnetic cable management, but expensive and gamer aesthetic.

Ranked #1
Uplift Desk - 2-Leg V2 Standing Desk
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Ranked #1
Flexispot - E7 Plus