Undersink + Instant hot, i think only Intrix and PuriEarth has it
If u do not need hot/cold water function, i think can go for undersink, table top type very limited choices

They are all branded OEM products. You can search a similar one on Taobao, 2 of our customers bought and connected to Disruptor, if I remember they paid something close to 2k RMB and so far no complaints.

Nothing it is all marketing BS. You can get rid of their filters, their filters are generic and definitely no good. All you need is hardware from them, then can connect any undersink filter to it. At least this is what our customers did