I was speaking more in generalities. I have Bighorn TL2's that I bought just before they came out with the TL3's (unknown to me at the time). I am delighted with the TL2's and see no reason to "upgrade" to TL3's, just because they are the "latest and greatest". TL3's aren't going to make me shoot "better" than what I shoot with TL2's. I suppose that sounds contradictory to my advice, but I have been nothing but pleased with the design, machining and finish of the TL2's. I have no experience with Impacts, but they have what appears to be a very, very good reputation as well. I also have an Ultimatum Deadline that I dearly love, but it gets spotty reviews on the Interwebz. Why, I don't know, it's my favorite action.
Really, my point is more along the lines of buy what you want, don't settle, whether it be Bighorn or Impact. You'll regret it and just end up selling the "settled" action at a loss. I am not trying to steer you toward the Bighorn or away from the Impact. There are so many great actions out there these days, one would have to try real hard to buy junk.
Splurge a little, spend a little more, buy for a lifetime. It's cheaper in the long run.