I used to own the Roland KC-300s. I feel the EV Sx-A100's sound quality easily knocks the socks off the KC300's. The EV's are very natural & clean sounding with a smooth response from top to botttom, perfect for acoustic jazz standards (my specialty too). The EV SX-A100's are actually pretty easy to handle because its ergonomically shaped, imho, much easier to handle & transport than the Roland KC-300's. The ONLY 'very minor' complaint with the EVs is that you hear a very slight amplifier hiss if you listen real close up in a very quiet room. I am very happy with my EV & Yamaha PSR2000 setup and recommend it highly.