Mike,
I have the 120 size stinger, so can't speak from anything except watching the 60 size. They all have a thick airfoil which slows down great for landings and has very stable flying qualities.
The most likely reason for the weight spread is: the variety of engine and servo weights people use and Lanier is notorious for lots of "heavy" plywood parts.
The 120 size lists weight as 11+ lbs - mine weighs 16 lbs, but has a gas engine and still flys great.

The 60 size will go good vertical with a 61FX and unlimited with a 91FX for the ones I've seen.

As an everyday sport flyer, they're hard to beat - you'll love it.

Dave