Sounds like a nifty little lens. I only wish it was EF and not EF-S, but I guess that's being selfish.
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RE: paul13walnut5's altitude comment -- this was from Griffith Park Observatory. Changing altitude from that vista isn't really an option. But certainly, I should be considering altitude if the location allows. Good tip.
Since I am using the same setup as Neuro, I am a bit biased. I have no problem trusting the clamp with my gear and the added weight of the clamp is negligible. As long as you put Locktite between the screw thingy and the clamp, all is good.