I can't speak for the ruggedness of the Grand Slam, but it seems to weather the trip from my trunk to the firing line without too much trouble [:D]. FWIW, I got that scope upon the recommendation of the folks at SWFA...I was looking at the Elites, and was even prepared to shell out the $$ for a Loopy, but the guy suggested the Grand Slam as an alternative to higher priced scopes, with no sacrifice in quality. And, the GS does not have an illuminated reticle...when it's too dark to shoot, I go home lol.
I saw a Burris Black Diamond 6x24 today...very nice scope, but I couldn't really see any difference between that and the Grand Slam, other than the extra x4 power. Plus, that's a honker...at least a 50mm objective by the looks of it.
If you can, look through as much glass at the range as possible...you'll see something you like sooner or later.
55Kingpin, if you're in No. VA somewhere, you're more than welcome to take a look at my Grand Slam; I could meet you at the NRA some night after work.