They've been on sale on Ebay for YEARS now. I remember drooling over them when I first got my 10/22; this was a minimum of 10 years back.
From what I have read, (I do not own one,) they are kind of shoddy worksmanship. I hope it works for you, and I would be interested to hear an After Action Report on it.
Ordered it two days ago and it came in today, love eBay! Looks like ok construction. A little rough in places but ok. I will tell you how the build goes once I complete it.
Being a sucker for bullpups, I have had one for a long time. Yes it is plastic, but so are a lot of firearms these days. As for the trigger pull, I spent some time smoothing out the contact points on the bar that connects the remote trigger to the 10/22 trigger.
Mine has been as reliable as any 10/22, but cleaning is a bear. Still, I am very happy with mine. Also gets a lot of attention at the range!
Oh yeah, I made that cut-out on the bottom of the grip to allow the use of the 25 round Butler Creek mags.