will fit a standard a1200 desktop but certainly not recommended (cooling issues). see, its only the start of a much bigger investment. before you know it you'll be wanting a tower conversion, better PSU, cdrom/dvd, bigger harddisk, idefix/powerflyer, indivision, zorro slots etc.. so choose wisely
compatibility on the 68k side is ofcourse as good as any 060 accelerator. ppc-wise it will cause you quite a bit more trouble to set up all the software like warpos, warp3d, cybergraphx etc. but once its running you will love it. and it runs OS4.x, too..
I will be flamed for recommending this to you, so please make up your mind yourself
its a big investment, which will give you lots in return, but you need to take a bigger risk, thats for sure.