i'm thinking about buying ultra coaster.. but before i do i want to now if its difficult to build coasters. And also i saw on the internet somewhere where you can take your coasters from rct into ultra coaster. Does that work well?

I've had Ultra Coaster for about 4 hours, and it is pretty tough to get at first. I can already build a full coaster (I can't seem to get inversions yet), but it is kinda hard to get the controls are sort of cumbersome. The view gets very frustrating, but once you get over that, it's ok. Go ahead and get it. It shouldn't take you to long to figure out.

Right it can be challenging...but VERY rewarding...the 3d views of the track is nearly professional grade and anything is possible. If your running into trouble at a certain part of the track simply take some time and work through it and its fine. And inversions can be a pain but are very doable.