The products perform completely different tasks, too, so it's not so much a case of 'not liking it' as buying the one that's right for your needs. Excecpt in the case of VisionLab, of course, which include everything.
But, no, you can't simply swap products around willy nilly.
I heard that if you buy both EffectsLab and CompositeLab, you can trade them for VisionLab, but you'd need to pay a certain amount of money. In the end, you would have payed more than if you'd have just bought VLab in the first place.