I bought a pair of trekkers in 2008 so I could skin up Tuckermans. It's 2.5 miles and they worked great. Just remember that when you get to (I think) Hojo's, you need to hike the rest of it. The do put you up high which seems odd at first but I had no issues skinning up (outside of it being exhausting as I wasn't ready physically). That was my second time on them. First time was at Mt Sunapee to practice with them. I went up Lower Ridge then Upper Ridge.
I didn't use them again until March of this season. I went up Crotched just for fun and a nice early morning workout. It does get your heart going. I do like skinning up but do it very infrequently. I probably will do it a few more times next season.
Keep in mind they aren't designed for Telemark skiing or skiing down hill. Also consider that when you take them out, you'll need a to safely carry them while you ski. I connect the two trekkers together with the blue strap that goes around your ankle. I then hang that around my neck like a doctor does a stethoscope with my jacket over that so they don't flop around.
I have gone up moderately steep trails (blues) but nothing extreme. I wouldn't want to go up anything steep with real AT gear either. It's too much work for my desires.
For what they are and what I want, they are fine. Every now and again I want to skin up before the lifts are running (so peaceful and quiet) and ski down. Plus you get a great workout. I would have done it more this past season if my schedule permitted.
If this is all you want out of it, get them. If you are going to eventually get dedicated gear anyway, I think I would try to figure a way to do that. Too many times I have bought something "good enough for now" and ended up buying something way better later. It ends up costing more unless the good enough stuff has a great resale value. Some times this can't be avoided, like when you're in college. Other times it can.
No matter what you do, you'll still get to ski.