Well, some like 'em and some don't.
I'm an upright player. I tried the ABG route, got a great big one that was the loudest in the store (interestingly, the el cheapo Dean), put flats on it, and to be heard wtihout amplification I've got to tear my fingers to shreds and still can't be heard over more than two nylon string guitars. And keep in mind I'm an upright player. I KNOW how to pull hard.
So, unamplified is a no-go. Next step is to try to dial in the crappy piezo saddle pickup, amp setting, blah blah blah blah, and eventually, hopefully, you can get it sounding kind of OK and loud enough to work.
Or, you can do what I did - take a cheap Squier Precision (fretted), put flats on it, foam rubber under the strings at the bridge, roll the tone control all the way off, amp set flat. Done! Sounds better than the ABG, with very little work. NO, it doesn't sound exactly like an upright, but it fits in the same sonic place. You know, that's what the thing was designed for in the first place - to replace the doghouse.
For a one-off, rather than trying to make a silk purse out of the ABG sow's ear, I'd use a regular electric that's not real flashy. Look - lots of bluegrass bands do this on tour, and that's a particularly persnickety crowd when it comes to electric instruments. Even there, the Fender bass gets a kind of pass just because people realize the upright's hard to manage in the real world.
Now if you WANT the exact specific ABG type of tone, and you want to fiddle with it till you get that particular thing, then go for it. But for the generic "we're gonna do an acoustic set", I suggest the Precision/flats/foam rubber/etc. is the quickest way to get a pleasing bass tone that you can work with.
What I think is more important is to play like you're playing an acoustic instrument. Fewer notes, less often!