Jandll (Jerry) has compared both the Mini-T, Muse and Hlly 90.
He says the Hlly has more oomph and bass, but lacks the midrange clarity and insight that the Mini-T has. He much prefers it to all the others.

Myself and Ali have compared the Mini-T with the Bantam (THINK it was the Gold but Ali can confirm).
The Bantam is better, more solid sounding but with the openness of the Mini-T.
The Mini-T is about 80% of what the Bantam does in my opinion.

For myself the Mini-T comfortably beat a Cambridge Audio 640A (£250) in every department except for bass weight.
This wasn't a problem though as I was too busy enjoying the music and not the equipment.
When I fitted the Gator though there was an increase in bass and with the T_Amp Im using just now theres NO shortage of bass - quite the opposite in fact; tight tuneful bass not boomy at all.
Great stuff.

Hope this helps?