Roborock
The then-startup that started it all for Valetudo. Only their old models are supported.
S7 Pro Ultra
At this point, Roborock fell behind and got leapfrogged by competition like the Dreame W10. This was the response to that. It lacked mop drying, which influencers didn't notice, but actual customers very much smelled... eventually.
S7 / T7S
This model saw a lot of pre-release marketing via influencers. That - expectedly - made for a miserable maintainer experience in context of Valetudo. First one to come with an auto-empty dock, which was innovative at the time.
Q7 Max
An S7 that is worse at mopping.
S6 Pure / P5
An S5 Max with worse mopping.
S4 Max
An S5 Max that can't mop.
S5 Max
Roborock's first pivot towards more cost-effective hardware, switching the eMMC+ext4 for a small NAND flash+squashfs.
S5
The first robot I, Hypfer, bought. Roborock's first product release under their own brand. Basically the Xiaomi V1 but with improved firmware including persistent maps.
S4 / T4
This one also exists. Not sure why.
S6 / T6
Technically the successor to the S5, though its main 'improvement' was just making rooting harder. Rarely seen, as hackers just kept buying the basically identical but easier-to-root S5 instead.