I love this thing, but due to the fact I am strapped for cash lately and need to solidify my studio with a regular piano and console, this is up for sale.
I have a great condition MicroKorg Synth XL for sale. It is a much better version of the regular MicroKorg. It has thicker keys, easier interface, 128 sounds, is programmable on a PC or Mac via USB, a vocoder, a very fun arpeggiator with latching, and easy to use knobs to change the sounds. I am asking for $400. the brand new ones come to $550 after tax. Pics etc... available on request. In the meantime here is a link to the site. This is great for bass players as it is the easiest out of the case synth to use. The arpeggiator is great live as well are the bass effects.
KORG microKORG XL Synthesizer/Vocoder
Korg MicroKorgXL Synth Keyboard 
