I have a wacom, and use it all the time when playing DS emulation, i can say i do prefer it alot more then mouse
It doe's give it that extra feel, and it's not slow at all you need to get use to pen tablet's and there driver's can speed or downspeed them if they seem slow to you
Most people will find them odd from moving to a mouse to a pen tablet, but they do take a while to get use to if you have never used one before, iv been useing mine for well over 2 year's now so to me it work's alot better then a mouse