Polyboost is only needed to Max 9-2009, Max 2010+ has Polyboost integrated (it's called Ribbon).
TexTools isn't buggy per say, it simply limited to the calls in Max. For example, if you want to create splits based upon smoothing groups for your UV's, you'll need to set your grouping smooth, make sure you don't have any sub objects selected before applying the UV modifier, because as soon as you use Textools split, it will need to select the smoothing groups via the Poly Modifier inorder to assess which ones to split.
It's more on 'how things are done in Max and thus needs to be worked around as such' as opposed to it being buggy.
If you want another UV tool to help, may I suggest XRay-Unwrap?
You can test out the trial here: http://www.raylightgames.com/xrayunwrap/trial.html