I've purchased these twice because I like bamboo blend and these are a good balance of density and price.  I found that going below 600GSM the towels are too thin.  These ones seem to be well-made and are holding up well after a few months.  Initially they are very soft but too smooth, and not as absorbent.  But after a few washes the "break in" and get a little surface texture and better absorbency.