Buying used

I would just want to know everyone's opinion on this. I'm interested in buy a t-lok and some gears for my stang and I saw some used ones. Now I know that alot of people don't trust used gears, but I've never really heard anything about used t-loks. Would would you guys say, should I get both used, new or mix? Thanks in advance.
 
No it's the same price to install new as it is to install used, but if you install used gears and find out they whine, or a used T-Lok and find out the clutches are worn out, you get to pay all over again (generally $200 or so) for the installation of new gears and/or a new T-Lok. However, since the used 4.10 gears you looking at are presumably on a T-Lok already, they might be worth considering. What is the price?