I'm a combo-only owner.
Partly it is due to the fact that buying a separate head and cab in this part of the world would cost me nearly double what a similar combo costs. As an example, my GK MB212ii cost me $1600 on sale. They aren't available now here but a GK MB210 is currently $1600 as well. To buy a 500w GK head will cost $1350 and a 210 Neo cabinet is an extra $1500. Unfortunately I haven't had much opportunity to use it since I got it around three years or so ago and it generally sits under a sheet in the studio. I'd really like to use it at volume again but my tinitus is happy it doesn't get much use.
My main combo is a Schertler Bass Fidelity B10 I got around 8 years or more ago.
They are not generally well known for bass amplification but are very well known for their high-end acoustic guitar amps. When I got it they retailed for around $1600 US (around $2400 Australian dollars) but I was lucky enough to get one brand new for only $600 (Aussie dollars). I thought it might be a scam but as it turned out the guy selling it on Ebay was looking at importing them so he got one of each model. The deal fell through so he just wanted his money back and nobody else put in a bid. I'd never tried one so it was a bit of a gamble and I just wanted a small practice amp but it has paid off fantastically.
It is, unsurprisingly, a 10" and tweeter which boasts 300w RMS. It kicks out a surprising amount of volume with no breaking up at all. I have used it on too many gigs to count, generally with folk-rock type bands, but even used it in rehearsals with a 3-piece rock band..... admittedly with a drummer who knows how to play without smashing every hit. It is also used pretty much every day in my studio. The horn hisses a little but I barely notice it unless the room is completely silent. It also has the clearest sounding DI I've ever used. All in all these two combo's will do anything I'll ever need.
Here's the B10 on my home made kickback stand.