Trap -
The folks at Lonewolf offer a thick strap (almost like a towstrap) that hooks on the front edge of the handclimber seat. This allows you to use the handclimber top like a sit and climb. I tried it, didn't get very far with it - nothing like a full bar to sit on. I just use the handclimber top with the old lean and lift. Sounds silly, but if you put your hands around the toothed belt, tuck your elbows onto the seat and work those abs you can be up the tree before you know it.
If you like the comfort of the Summit but want a drop bar, the Razor (I think...)has a front drop bar that will swing under your seat and out of the way. My friend swears by his for comfort. I like my LW because it packs down so much nicer - he ends up dragging half the woods home with him.
I could nit pick about stands all day, but I love the platform on the LW, but I greatly perfer the climbing arms on my Gorilla stand (a copy of the old man climber arms), they have a much more positive lock around the tree, and with the safety strap tightened there's no way the platform can take off down the tree. The platform isn't quite as large though...
Give and take I suppose. Right now I'm using the LW handclimber top with the Gorilla bottom - works well for me.