Well it depends.
I haven't used mine since I got my TG-77, which essentially supercedes it. If you love FM and don't mind a learning curve, look into the TG/SY series of synths. AFM simply blows regular FM out of the universe.
The TX-802 is just like 8 DX7s, so if you like that synth, then that is a good thing (you will get all of the presets). It is hell to edit. Yes it is...even after you have used it a lot, still like paiting a room through a keyhole.
Don't pay over 170$ (American) for it, unless you have cash to blow or the pickings are really that slim. Don't be afraid to use eBay, also. I got mine for 150$ and that was a year ago.
JP-8080, Virus B, TG-77, JD-990, D-550, XV-5080, CS1x, Matrix 1000, SE-1, SuperNova II Pro Rack, MKS-50, EMX-1, TX-802, Nord Rack 2X, Korg RADIAS