Last Friday I played a pub and used a mini rig for the first time. I used a Carvin BX500 and an Eden EX112 cabinet. The Cab is 300 Watts and is 8 Ohms. The BX500 drops to 300 Watts when run with an 8 Ohm Cab. I was very pleasantly surprised at the amount of low end and headroom with that combination. I normally gig with the BX500 and a 4 Ohm Carvin 10.2 2x10 ported cab at 500 watts. To top off the mini rig, I used a Fender Mustang Bass. The whole thing was light weight and put out much more sound than expected. The Eden EX112 doesn't have a horn, but the BX500's EQ took care of that.
I'm definitely not averse to the mini-rig. They save my financial butt occasionally on long trips so I can double up with the keyboard player, and they're great for when the schlep is major. I'd much rather be playing something bigger but you can always use a good mini-rig if you play out a lot.
My mini rig saves my back from pain for my trio smooth music performances. Aguilar TH 350 (2 lbs) and fender rumble 2 x 8 cabinet (28 lbs). For compressor I use the Zoom B3. It's a loud live mini rig. I use my amp at 3 of volume and 2 of gain!