I was playing with the MXR flanger alot last night and this morning. Its a great flanger, but has quite a distinct synthetic sounding tone indeed. It doesn't do really organic sounding stuff, or go really wild/experimental. Nevertheless it easily nails the Van Halen/jet engine flange... and further more it has some other nice tones - a flangey chorus, a filter, and you can get a sort of phaser out of it too, plus a tremolo.
Maybe an Ibanez would be a nice compliment to it, it seems like the Ibanez offers a more subtle sound, with some self oscillation too.
I'm pretty happy anyway, I won't be getting that Ibanez unless its really cheap.