I use TabIt which is similar to Guitar-Pro, but it only costs $19 and is a lot easier to figure out and everything is much more intuitive in my opinion. I have GP5 and I've used GP4, but comparative to TabIt, I'm really not impressed, so I only use GP when I want to download a tab that isn't available on the TabIt site yet.
For my original compositions, I use TabIt with imported soundfonts. If you don't have a soundfont compatible soundcard, then I guess GP5's RSE is probably the next best thing, but it really can't even compare to the soundquality of even some of the free soundfonts that you can download from any number of sites.
Here are some of my originals, recorded directly from TabIt playback (with soundfonts, of course):
BlackMetalWhiteGuy - Overture - a melodic / symphonic black metal piece that I started in December 2004, but never finished.
Matthew F. Tabor - Arabian Trance (sample) - Gypsy scale trance
Matthew F. Tabor - Eastern Trance (sample) - Asian inspired trance
Matthew F. Tabor - Phylogenetic Inertia - a trance loop
Naturalistic Fallacy - a collaboration I started that seven other members of the TabIt forums contributed to
Urbanis Inarticulata - Realm of the Mundane - a rap loop
Video capture of TabIt playback - just some guitar trio that I wrote a couple years ago. There may be some audio lag, but this an issue with the motion capture program, not TabIt.
http://www.myspace.com/bmwgmusic - I have a couple more songs here.
Ive been using Guitar pro for ages now , even though ive come across a few GP wanna be's if you all can remember Power tab it was a good attempt tho but guitar pro still comes first theyve developed the software brilliantly especially after adding the RSE engine it might not be much but i definitely love how the drums sound when its on , in my opinion knowing how to use GP is a must , Cheers
I know exactly what you mean. I downloaded PT to listen to some Nekrogoblikon tabs and it is probably the worst music notation program I've ever used.