I upgraded from a TC combo amplifier (BG250) that I had used for 5 or more years. Performing professionally at wedding/events/functions, the TC was fairly light and plenty loud for most events I performed at. I'd always been interested in Mark Bass and seen other Bass players use them, but the price had always put me off buying one, plus my TC amplifier met my needs. The TC finally died and wasn't worth repairing, so I decided to finally buy the Mark Bass setup. I bought this head paired with the 58R cab 121 and I have to say it was one of the best decisions I've made in a long time. It was expensive compared to my TC yes, but worth the investment. This head has transformed my sound, the ultra low control is brilliant, adds such depth and punch to the sound, plus the 5 band EQ which makes tailoring your sound much easier. The Milleriser and Old School tone controls, in combination with the 5 band EQ makes for such a huge range of possible sounds/tones. The overall setup (head and cab) is very lightweight and easy to transport. I am still playing with the sound, but the old school setting gives a deep bassy/mids sounds from what I can find and sounds a little more like an upright or fretless. Overall I'm very happy with the product, and it comes with a good warranty too!