1) Wheels work fine for dry conditions. If it was wetter our here, I'd be wishing I had tracks.
2) The lift height I think is about 114", so almost 10'.
3) It would definitely have been useful for lifting the trusses up on the shed. It would have been even better help leveling the pad.
The backhoe attachment will dig down to about 6', according to the literature. That might be a bit of hyperbole.
I've got a tree to move, and brush to dig out, and I have a little spade attachment coming that will attach to the forks to allow it to dig like a really powerful shovel.
So, yeah, with the attachments you can get, this thing can be pretty versatile.
As far as cost, there are a few types of backhoe attachments you can get. Since I really won't be digging holes everyday, I got this kind which is a lot less expensive. They make kinds that still attach to the skidsteer, but swivel, and even bigger ones that really just use the skidsteer to move around and you have to get out and sit on.
As far as pricing, well, I thought these were pretty reasonable new. I could have probably searched for used ones, but I kind of wanted to get started on a few projects and didn't feel like searching around for them.
I'd been saving up for a while for a Compact Utility Tractor, and the skidsteer and all these attachments came in considerably under what my budget was....