I bought a pair of the ADJ PS2's,a QMX2 BPM mixer,and a back up PS1 about 2 years ago,I believe the warranty is off,but my gear is almost mint condition,well taken care of,and i added an effects processor(a ko$$ ka$ p@D) ...now its a bullet proof system!!! I only dj as a hobby,but i like to be able manipulate music like a pro! ....but the PS2's or the PS1's are no longer in production,anyone think i should sell now and upgrade,and when is it time to upgrade?

Well IMHO there are two times when you should upgrade your system.

1st, when something breaks.

2nd, when there are new features added that you just need to have.

That's really a tough decision to make man. You need to decide what it is you want to do. Do you need MP3, is the gear functioning properly, can you get what you are trying to accomplish done with what you have. Look at those things and if you feel like you are limited in any way then look at maybe upgrading to the CDI-500 MP3 players. Your mixer will be fine unless you are like me and like all your gear to be as close to the same color as possible. In that case you will need to get the QD-6 to match the CDI's.