My band had our first two gigs recently, both went quite well. They were both in the same venue, the first one I used someone else's cab and wish I hadn't. It was a compact 410 and was too low to hear anything out of. The sound guy also plugged me straight into a DI, bypass the amp totally and he refused to put anything through the monitors. Second gig (remember, same venue), I used my own cab, which was infinitely better for starters and we had a different sound guy, who MIC'd up the bass cab and did whatever we asked with the monitors and my word it sounded f***ing massive. I don't recall sound guys mic'ing up bass much these days?! They should do...
Anyway, fully enjoyed both gigs. Our set is only 15-20 minutes (5 songs, average 3 minutes each, we've just written a couple of new ones though) but I think it'll definitely be worth taking my own cab to all gigs in the future, even if it is a tiny bit of a ballache, it's worth it actually knowing what sound you're going to have.