I used to use T-Racks before I moved on to the UAD Mastering Tools, or our Manley Massive Passive, Slam! and Hardware L2 at the studio...
I thought it was a very easy to use mastering program, hard to f*ck up if you kept with the 'gentle' presets and worked from there. For what you need to do, Beaky, I think it's a pretty easy to use tool. There might be a BIT cheaper, but I'm not sure there are many easier to use. I have mastered dozens of CD's for other people, studios, etc.. If you haven't got decent studio monitors, you are taking a chance doing this on lesser speakers, but if you use the 'gentle' presets in T-Racks, it's fairly easy to get a good result sort of 'blind'
It sure makes for an easy volume pump for demos to post here, etc..