I'm not familiar with their products but will add this. In my humble opinion, if you think the products are pricey, it is almost certain that there are cheaper and just as good or better products out there. Making your own such as DIY vitamin C serum being the most cost effective example.
I was looking wistfully at some of their exfoliants - but then started using vitamin C serum (ascorbic acid) and Retin-A (a form of retinoic acid) - which both have such an exfoliant effect that I seriously haven't needed anything else. I am so glad that I did not waste any money on the MD products.