I have them too. They fit well, can be secured well, and are very convenient. Now that I've had saddlebags for some time, I can't imagine not having them. I've grown accustomed to having a "trunk" on the bike, always putting something in there. The saddlebags rest against the tailpipes, but many people have confirmed that melting/heating has never been an issue (my experience too).
I quite prefer the look of a top box and the lockability of it, so when such time has passed that it's been a decent duration since I last bought something on the bike (so it will get past the domestic accounting department without arched eyebrows), I may replace my CoreTechs with that.