What lens are you using on the MH100 (I'm assuming that you meant MH and not WH)? As I mentioned, for smaller lenses it can be a great compact solution. For larger lenses it works but it is pulling to the side as the thing is side mounting a huge lens....physics don't lie and you are always counterbalancing that the entire time you are shooting....sort of defeats the purpose. The JR 3 is so small and light that it just works 100x better than the MH100 for larger lenses like 400/2.8 and 600/4 (even the latest lighter versions).