I have the Shappell DX 3000 and love it. It is easy to set up, but not as mobile as the Trap. However, you can easily stand up to stretch your legs if needed with out getting out of the shelter. You can't do that with the traps. I have a bad knee and need to stand every 30 mins or so.
It is very light and easy to pull on ice or thin snow cover. When the snow gets deeper, it tends to dig in. Plus, although it has bucket spots molded into it, it is tough to carry gear other than buckets on it. I bought an Otter sled. The shelter fits nicely on top and it also protects the gear in the sled. I pull it by hand and behind a snowmobile.
You should be able to find a DX 3000 or 2000 for much less than $350.