That's it, it worked, and the license let it pop up on a few CD cover discs with no hassle. At the time, we were a SCO Unix house, solid, worked, no complaints but the cost wasn't trivial. Still, worked and worked well. Messing about we looked at other unix things, one was.. (going off memory now) MKS Unix I think it was. And... can't recall the other, some 99 quid one that was also rough around the edges. Now, Linux was free, no 'get in touch for commercial reasons' and within a couple of weeks, we got an updated version. The other cheapo unixes we looked at had problems and didn't look like they were being fixed quick.
Loading up all our code, and doing a make... it worked. It all flippin worked. Was /really/ scary to see that the compiler was very decent, the headers all included, if it DID need any tweaks, they were so inconsequential that we knocked them out in minutes. Bosses were impressed, but worried about support, and that's why as a company we didn't go official, but all of us said "this is going to dominate one day, it works and works well".
But overall... availability/cost was the thing that got us looking at it. Plus, compared to other unix versions, it felt very similar to SCO in it's layout at the time (at least Slakware did, Yggdrasil had better gfx support for the cards I had at the time (Trident...? maybe?) but Slackware was very familiar.
Though I'd not have ever expected that one day I'd be lugging a phone around with me that ran Linux at it's core.