I have used comicsupply to buy my mylars and think they are great. I think your problem lies more with the brand than the company. Most brands are absolute shit. Back when I was still using polybags and regular backings, I used the brand this guy sells on eBay:
The Comic Zone
The brand is fun-yet, some Chinese company I would assume. However, the quality of their bags, IMO, is unmatched by any other brand (like Ultra-Pro, Comic Defense, Collector Safe). Also, he has bags that have a resealable flap, which is convenient if you are always reading your books. Keep in mind with the sizes that Current is different from Regular.