The J.A. Custom Discovery Basic harmonica has better response and tuning than out-of-the-box chromatic harmonicas. Upgraded with a new 2 part slide system the Discovery is one of the best 12 hole chromatic harmonicas on the market. The 2 part slide mechanism, gives the harmonica a much better slide action, but it also give the player better response and dynamics. It is assembled with screws for easy maintenance. Basic has a little bit better reed response than out of the box Discovery, however the slide mechanism is not comparable to the original, the new one is far better.