I'm a beginner, and have no experience with the TW, but on the recommendation of John Horrigan, I bought the TAG 101, Package C. I've had it for a few months now and I absolutely love it. And Chris Williams was great to deal with and extremely helpful, when I called him to order, he spent a good 30 minutes on the phone with me answering lots of beginner questions, including some that had nothing to do with his grinder. I love the versatility of being able to flip it on its side and have the belt run horizontally. Like I said, I'm a beginner, this is my first grinder and I have yet to have enough experience to state an opinion on its limitations, because as of yet I haven't found any. Great machine from a great company.
Edited to add - I don't have 220 in my workspace, so 115 was the only way I could go. It's a 1.5hp motor, and I've pushed on it pretty hard just to see what it would take to bog it down. It took more pressure than I think I would ever use when actually grinding on a knife.