What do you like best?
About the only thing I can comment on positively is the fact they use Plesk for the hosting management panel, which is one of the two biggest panels, cPanel being the biggest and the best.
Other than this I find MT very disappointing for a company they gives itself such a professional front.
What do you dislike?
Hosting with MT is not ideal for any of the clients who I work with, it appears their VPS is stretched within it's limits to cram as many clients as possible onto their servers, my feeling for this is because the VPS servers seem to be slow and clunky with terrible First Time Byte results.
Fairly often the VPS will slow down or fail to respond completely, which for a medium sized business is extremely frustrating.
I find other VPS hosting providers have better performance and usually at half the cost. With much better support.
Recommendations to others considering the product
Make sure you do your research and make sure your apps are not heavy or slow on their service.
Try and get an evaluation before you commit, I have not had great experiences with these guys.
What business problems are you solving with the product? What benefits have you realized?
MT is not a hosting provider I use personally, however we have many clients who use MT to host their businesses, so we end up working with MT allot. They provide a hosting solution which is easy for clients to setup. However this is where the benefits end, and personally would not use or recommend these guys for hosting anything.