The downside was a lower pay now and substantially larger risk of losing my job compared to other places. And developer work here isn't exactly hard to find.

The potential upside was... maybe two years down the line they'd start paying me what other people were willing to pay me now. The guy I negotiated with even tried to make it sound like we were all there on the same terms cos our monthly pay was the same, leaving out that I'd be the only without a share, the other four sharing the company equally... have to say I walked away from that one.