I have the original Voicemaster (which pre-dated the Voicemaster Pro). There was I time I knew the diference between the two, but it's been too long and I've forgotten - however, they share many like components)
The baisc preamp section is decent, the compression is workable but not great. The EQ is generic and not exceptional. The gating is decent and the de-esser does the job. It's not a great unit, but like any gear, I've learned to use it to the best of it's capabilities.
I bought it because I got it for less then cost (music store I worked in had 2 that weren't selling, so me and another guy each bought one - cheap). At the time I thought having all the bells and whistles in one unit (a "channel strip") would be great - I was wrong. At the end of the day, I (and I think most would agree) have learned that you are normally better to purchase a dedicated pre-amp, a dedicated compressor, etc. The all in one units often do many things, but none of them excepttionally well.
I've never used the TC Voiceworks so I can't compare, but I do have a TC Voice Prism (which I beleive has the same basic preamp) and I do have a Blue Tube (which I agree can make too much noise). I think think the pre-amp in my Voicemaster is a little better (not significantly better) than
the Voice Prism & the Blue Tube. However, as indicated I think most of the Focusrite processing is a little weak.
It never hurts to have a few different pres (each has it's own "sound"). If you think you can get the Fousrite for a good price it could be a decent piece of gear - but I don't think you will find it to be amazingly better than what you have.