Sorry about the delay in responding....
The differences are that on the HT500 the tip of the barrel can accommodate a door/window needle and the basket is apparently treated with Teflon. The window needle is like a ball pump needle which you fit on the tip so you can squirt foam deep into small gaps when installing a new door or window. They are one time use only but they are cheap. Personally I don't need this feature as I'd really rather just use caulk for such miniscule gaps. The Teflon basket also doesn't interest me because you should be keeping you gun clean to begin with. Also a part of the cleaning process often involves scraping the basket with a razor to get dried foam off and that will trash any coating any way.
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
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