So, Both the EVO and the BHB offer a means of adding weight somewhere near to or between the hands. The BHB allows for addition of weight into the pistol grip and between the barrels, behind the forend. The upside is that you can make small incremental adjustments without a lot of fussing around. it is also less expensive than the Evo option. The EVO allows for the addition or removal of differently weighted side plates. This does involve removal of the buttstock. And the weight increments are larger than those offered by the BHB. BUT...the additional weight is 100% between the hands!! So, if you want to add some weight and play with the balance point, BHB is for you. If you want to add weight and increase the speed of your pointing/insertion ahead of the target, then EVO is for you. If you hold the gun by your side parallel to the ground, with your hand around the action and twist your hand right/left right, it swings/changes direction very very quickly.The EVO is the Zoli equivalent of the Perazzi Hi Tech, except that you can change the weights of the Zoli and I believe the Perazzi is fixed. FWIW...I have a Z-sport with custom stock and do not want to sell it to buy an EVO, so what I am trying is taking the barrel weights (powerful, rare earth magnets) that came with my BHB and I have put them all on the underside of the action, just ahead of the trigger. Unobtrusive, variable weight in 0.1 oz. increments. It looks great, and is very very inexpensive. But I will know on Wednesday if the recoil causes the weights to shift.. or not.