Just moved from a Trace head (30+ kg), 4x10'' cab (50kg), 1x15'' cab (40kg) full stack to a Puma 212 Combo. The stack had a great sound, but I didn't like to carry it any more.
The Puma 212 Combo has 500 Watts in 4 Ohms, 320 Watts in 8 Ohms. The internal speakers are 8 Ohm, so you can plug in another cabinet.
For the highs and highmids it has special driver that is no horn, but praised capable to have high output beyond 10kHz.
The eq section is equal to the Puma 500: gain,taste,low lomid, himid, high,master.
I have to confess that I purchaised this thing blindly. There was an occasion in E-bay by a dealer for almost half the price ($1280) and nobody did a bid - so I had to. I never played a TecAmp before.
I immediately took it to an open air Modern Jazz gig, just checking it works.
So I stuffed my fretless, effect board and the small Puma into the car.
Heading for the stage, wheeling the 21,5 kg amp behind me - he has wheels and a handle - yep! it need it for its enormous weight ;-)
Switched on, adjust gain, master to about 10 oClock, mwoaahhhhhhh - the mixing guy immediately yelled: "hey man, that amp is much too loud." ... Whow! What a deep, deep powerful response from that small cab! Unbelievable!
My experiences soundwise: this is a completely different breed than the Trace I used before. The sound of the Trace was more middy, the sound of the TecAmp is more scooped (compared to the trace). I get a good setting with the taste to about 11 and the lowmid to 1 o'clock. Still it has more deepth in the bass and more silvery highs than the trace, but also with good mid definition. What also impressed my was the transparency of the sound in the lows. The Trace tends to get muddy-boomy the TecAmp combo is very low down but transparent and well controlled. I played the amp also with a fretted Marleaux bass - same impression as with the fretless.
The really big surprise was the 4'' midhigh cone driver. Normally this kind of design leaves you missing the very high airy trebles needed for very modern hifi sounds. This speaker simply kills! It delivers highs with such an easyness I was startled! And this completely without that harshness that horn drivers tend to offer! You can forget about the Fostex horn of my 4x10 cabinet - the 4'' driver of the TecAmp sounds ways better. I'm glad no longer have to play with attenuators to control harshness and shrillness of a horn. This is perfect!
Bottom line: well, I improved in both ways - less to carry but richer sound. I thought adding a second cab, but so far I can't imagine a gig-situation that make it inevitable. In my 30 years of being bassist this is the most radical improvement step and biggest suprise I experienced: 100kg less weight + richer sound := 100% more fun playing gigs!