If you're tasting burning glass, you have a crappy and thin glass screen. Mine are solid PYREX and none are thinner than 4mm. And I don't have to constantly clean it at all, maybe every ten bowls I just pop it out, roll it in my fingers twice, pop it back in, hits like a champ.
But then again I'm the type of person to make sure everything WORKS WELL before I make my purchase and leave the shop, right down to finding THE RIGHT SCREEN (if needed) for a piece. I'll sit there and try different screens and dry-hit the pipe before I pick one out.