I haven't had a 10/22 with the plastic trigger guard housing yet, but I am pretty well impressed with the 22/45 plastic grip frames. I think the plastic may be zytel---same material used to make M16 and M4 stocks. I would wait till they get out into the market place and the price should be well below the $90 MSRP posted on the link.
http://shopruger.com/BXTrigger/productinfo/90462/
http://shopruger.com/BXTrigger/productinfo/90462/