As always, down to personal preference; but the Blaser sticks work best for me. I have tried all sorts, from home made up to the Blaser ones. The tracking function of the front grip really is useful. The locking collars on mine did come loose initially, then I used my monkey strength to tighten them - no probs since.
Both my centre fire rifles will sit unsupported in the yokes of the sticks, which I find a big plus point. Allows me to faff about while only using the one hand to support the sticks.