Smaller groups within BBs?

Hey guys, it's story followed by question time.

So, I had a superday with the trading side of one of the BBs, went to NY, got shot down, etc. A friend in the same BB sent my resume to the quants, and a trading group I'd never heard of contacted me asking if I was interested. I said sure, and they sent me an EXAM that I needed to pass in order to get an interview (three part thing: linear regressions+ probability, financial engineering, programming). Basically, did that, had a phone interview, got an offer.

But I'm just a little curious about this kind of thing. Do a lot of these BBs have these smaller low profile trading groups like this one? I think it's fair to call these guys low profile, the only things I could find on them online was a internship description from four years ago when the group first started. It's hilariously out of date, specifically requesting humanities majors (but most humanities majors would have had a tough time passing the pre-interview exam).

What do you guys know about these kinds of gigs? Do you think it'll be good? Sorry I'm begin vague, they're taking such small amount of interns that any further information pretty much identifies me.

Basically, it's like a quant desk, but in it's own separate group. Any opinions?

Humorously enough, searching for this group in WSO literally turns up one from about 5 years ago (when the group was first started, now repurposed).