I don't recommend them, even though I use a Red Wine Audio Reali-T. (modded T-Amp + Scott Nixon DAC + DACT SA volume control + 12V SLA battery power)
The advantage of the T-Amp (cap modded original T-Amp or a Super T-Amp, on a 12V SLA or 13.8V linear power supply) is that it has great detail, good bass after the cap replacement, and a low noise floor. The bad news is that it has about 6 WPC before it starts clipping.
Meaning, it's a very inflexible amp. You pretty much need high efficiency (>93 dB/watt at 1 m) for placement farther out than two meters. And unless you're a single driver, no x-over fan, your speaker choices are limited compared to higher power amplifiers.
Of course, for a $100 bucks or so, it doesn't cost too much to experiment with them.