Well, Buckmagnet, we are on different sides of the fence on this one.
I just bought a Vipertec about a month and a half ago and it is still amazing me. When I shopped around, I shot the Vipertec, the Xtec, Bowtech Liberty and a Mathews Legacy. It really came down to the Vipertec and the Liberty as is your predicament. So, I shot them both again. One a vibration level and noise level, hand downs the Vipertec was easily more quiet and vibration free IMO. The Vipertec also balanced better for me. Now balance is a personal issue, what balances for me, wont balance for everyone.
This little bow continues to amaze me. I'm getting very good groups out to 40 yards with this bow. This is surprising given its short ATA. I think the bigger brace helps it out a lot there. IT actually feels like a 33-34" ATA bow.
The Liberty is an excellent bow. In fact, I feel that its the best bow Bowtech produced to date. I almost swung in that direction, but I just like the feel of a Hoyt better.
I personally don't think you can go wrong either way. Both bows speeds are very comparable and specs are close. Both companies have an excellent reputation and good service should you need it.
Take your time and pick what you shoot best.