While I'm not familiar with all the gear, I'd say that if the equipment is in fair shape and the boots fit you well it'll be a great price to get into an AT setup. By my rough estimate, you could easily spend about $2000 for comparable new gear before you get out of the shop. AT gear usually holds resale value pretty well because its such a specialty niche, rather than a commodity market like downhill equipment. Sometimes you stumble across a great deal but they're not really common unless you're plugged into a backcountry network or get lucky.
For your first AT gear, you probably don't need to be as worried about the weight as much as the fit of the boots & compatibility with bindings, condition of the gear, etc. A big qestion is how you intend to use the gear. Do you see yourself dropping 15 feet of air into steep couloirs or skiing mellow glades after a picnic with your friends who are learning to tele? Other questions you need to ask now are:
- Will the skis turn easily in soft snow and hold an edge on firm snow?
- If the skis are super light-weight and as a result, flimsy, will that work for you (ie have you had to quit skiing Rossignols because you break every pair you get your hands on)?
- Are the boots going to provide comfort on the climb and stability on the descent that you'll want.
- Is the equipment (particularly the skis/bindings) in good shape or have they been thrashed by several seasons as someone's mainstay in the ski area and backcountry as well?
Now the really good thing about picking up your AT gear for $600. You'll have plenty left over to get yourself a top of the line transceiver. That's something you don't want to skimp on, buy used, or go without.
Have fun in the backcountry and be safe.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse