Just a memo: you could NOT use a faster FPU than your CPU. If you bought a faster FPU, simply put a cristal the same clock of CPU.
Yes, they are various progs who really use the FPU: scala, Raytracers, MUI (!), MCP (new one arrives on december)....
Games: Genetic Species, TFX, Quake, Doom, Myst (the Amiga versions, of course). And a lot more. :-D
Mpega fpu version IS SLOWER than integer version (don“t ask why, I could reply) ;-)