At first I thought Bismark was a really great way to play all my free soundfonts.
But I soon discovered I couldn't load more than 8 of them (VST limit), and that 8 Bismarks, or even 4, on the screen quickly became very cluttered and confusing. All these little blue boxes everywhere, and, the Sample Name Area difficult to spot, being in a tiny font in the bottom right corner.
However, if you only want to play one or two soundfonts simultaneously then Bismark works fine, and the sound quality is fine.
When I needed support I got it 3 days later and in hard-to-understand english.
The filters and envelopes are more like on-off buttons, and don't compare with a synth.
Yes, Bismark plays soundfonts, but in a way you'll quickly grow out of.
If you have ambitious plans, ie, 4 soundfont tracks or more, then pay a little more and get VSampler, with 16 tracks and a properly organised layout.