My main gigging amp these days is an older model BA210 (220 watt non-effects model), and it may or may not have the same features as the 300, but I'll share my likes/dislikes of mine for what it's worth since it's similar.
What I like:
1. The tone. I set the "style" to 2, bass knob to 5, mid knob to 7, high knob varies depending on how new my strings are, gain around 4, master volume varies on venue, and I can get a nice, somewhat edgy SVT tone.
2. The size. It's physically small, takes up little stage space (important) and packing space (really important).
3. The speakers placement. While not truly vertical, are at least caddy-cornered, so it's closer to the optimum vertical configuration than many other 210s.
4. Built in tuner. I know not all BA series combos have this, but I really like having a gigging rig that only needs 1 cable.
5. DI. It's got one, and it works well.
6. Side handles. Having a buddy grabbing one side really helps.
7. Casters. It's got 'em, and they help.
8. It's robust. Although I take care of my equipment, this amp has not been babied. It's seen sweltering outdoor gigs, dusty questionable party gigs, chilly windblown gigs, rowdy wedding gigs, and has never missed a beat or failed to deliver.
What I don't like:
1. Weight. It's not the lightest combo out there, but I think because the combo is so small that it just seems it shouldn't weigh that much. But at least it's got nice side handles and casters to make transport as easy as possible.
2. DI doesn't have a ground lift, or separate volume control. Don't misunderstand, it's a great sounding DI and I haven't had any trouble with it, but I do think those features are missing.
3. No external speaker. I hesitate putting this under "don't like", because I have no problem with it, and actually prefer having full power in one package, BUT you don't see a single review of these amps without mentioning this as a drawback. So if you want your combo to transform into your "full stack", then you'd better shop for a different combo.
Anyway, hope some of this is helpful.
