Hi BruHi Chris,
I've been using home projectors in my house since the nineties, and overall this is right now the best spec and best performing ultra short throw projector. Picture quality is very good and bright (I guess this is the brightest UST PJ on the market?). Although using a very good screen is truly a plus especially if you often watch in a bright room.
I bought mine from ebay, and it's the chinese version. You can change the language later to english so it's not a problem. It has optical audio out, so if you want to connect it to the sonos, make sure it has an optical in. The built-in speakers is very good actually.
There is a very annoying problem with the optical out and HDMI Arc. When it plays digital sounds (like from netflix.. mostly are Dolby Digital), it has a sound delay of about 500msec. I'm still figuring out how to fix this. Apparently, this problem exists in all xiaomi PJ types. I've contacted xiaomi and they're aware of this problem, but until now, there has been no fix. I thought you should know this before buying it.
Also, if you're not used to using a projector, you might find the fan noise quite annoying. It's quieter compared to other PJs, but for me it's not quiet enough.
Hope this helps.
Went ahead and purchased it anyway. I see what you mean about the lipsync. Did you buy that device that was suggested to you in the earlier post to fix this problem. Mine works fine on normal sky channels but when i watch HD channels there is a slight delay in sound.