I had one. It shot great but didn't fit my hands very well. The LOP from pistol grip to trigger on them is fairly long even with the trigger in the rear most postition. You will find many with the same opinion. The BT 100 with regular Trap stock is a great gun. Far better than the BT 99 in my opinion.
Had one, it shot fine but I could just not get that stock to fit. Needed some castoff and could have used an adjustable comb. LOP was not an issue - but be advised that a MC stock or regular Trap stock are extremely hard to find.
I am shooting one now it is my main gun and I don't see my self switching anytime soon. I does a great job of dispersing recoil. I was worried that it would do damage to my thumb but it was fine for some of the long 3-4 day X300 targets a day. Durring one of the long shoots I did put a little moleskin in it right where it hit the thumb and it was fine. The trigger is easy for me to reach and I do not have big hands. All in all the BT-100 is a great shooter and really breaks the targets. I'm sure GW22 will be chiming in his praises for the BT100. Oscar
I have owned two of them (currently shoot one now) and really like them. The MC comb fits me well as is, and the length of pull is not a problem for me. Mine shoots about 70/30 poi. They are not for everybody, but it fits, you will probably like it.