I have very recently been put onto VideoReDo through this forum.
It costs about $95 and I will be puchasing a copy very shortly,
however it does come with a fully functional trial and the trial
key is sent to your email after registration. It is capable of
opening MTS according to the website and Videos can be trimmed
which is a feature I was after.
Give it a free try- I was more than happy with the results and the recommendation
and I'm sure that if it opens MTS files it would export them too.
Edit: Product instructional and details can be found here