I'm Daniel - really looking forward to getting a chance to play with TPS!
Other theme park / coaster software i've used are:
Theme park (including the "inc" and "world" ones) - too busy getting you to accomplish things like "50000 visitors", when you just want to design a coaster.
RCT3 - all in all - a nice to use piece of software, with good flexibility - takes a bit of tweaking to make a ride look realistic, but pretty good.
Hyper rails - had potential, but let down by bugginess and bad documentation / support
No limits - sorry - too hard for me!