Very happy with Edge products and customer service. ran a billet edge 2800 in 09 and now a billet edge 3400 and still have oem tranny @ 137k. Also invest in a tranny temp gauge to keep an eye out.
I like the 2800 billet edge I have. I bought it used from ^ and it's working great. I have had it installed for roughly 20k miles I believe. I didn't even see any real increase in trans temp, and towing seems to be unaffected, although I've never towed more than ~5,000lbs.