Bipods are a very personal piece of gear as mtnGhost already pointed out. Perfect examples are pan, cant and tilt. Most of the time I'm using a bipod it's from the bench and I don't want the ability to pan. I just want stability and fewer knobs to come loose. From the bench, I don't mind weight either, but in the field I certainly do. If you're going to use it from a bench, don't mind the weight and money is no object, the FC-G2 would be my choice. If weight is a concern, check out the new WB-4.
Accu-Tac bipods are great bipods but there are many others out there to like Atlas, Evolution Bipods, Mag Pul, Caldwell, Ckye Pod, Warne, UTG and others too, depending on your preferences. My point is simply that there are lots of great options these days and most all are great.
As far as accessories, there's a company called Snap Foot that makes modular bipod feet kits. They come with posable feet, spike feet, rubber feet and necessary adapters. You can also buy extensions. What's nice is that the kit comes with everything you need for about $80. Leg extensions are extra but worth it. These are great kits. Not sure if they're available for the Accu Tac yet but they were in the works the last time I talked to them about it. Good luck with your decision.
Stoti