[quote name='mushbah']watchu pickin on guitar for
improv is all about playin guitar by itself and if you get it right it sounds amazing[/QUOTE]
Nothing wrong with guitar, I just enjoy the sound the saxaphone makes. Guitars sound great too, it's just a preference of mine. Add a nice bit of sax into a song, especially like the song called "Omae wo Kesshite Hanasanai" by Hound Dog for example (I can upload it for anyone interested) and it adds some nice variety into it.
Piano also can sound good added to a song, like some of X-Japan's stuff for example.