I've been using propane grills for a number of years, now. Although simple to use and quicker at reaching their desired heat, I find they're quite a pain to clean and maintain. Yearly, I have to replace the burners, lava rocks, and scrape all the crud off the sides. I think the glass plate may or may not help in this department, however, it all depends on if you let the grease sit on it for too long.
I recently switched back to charcoal for the time being and I have to mention, the taste you get from charcoal is unbeatable by any propane grill. With that in mind, what kind of taste are you going to get from a virtually flame-less grill? To me, it's no different than sticking a steak in the oven (assuming an oven could reach 700-900*).