I'd thought about sending off for one of these, in the past, but just never got around to it. After reading this truly inspiring thread, however, I ordered one last Friday, and it arrived today. And I'm glad I did: they're a cracking piece of kit. They must have some big lads in that there Swedish Army, though, because I've got a 50" chest, and mine's got loads of room (I was a bit concerned that the sizes only went up to XL). Brilliant: plenty of room to move, and plenty of room for layers when the weather gets colder.
Haven't made any final decisions on mods, yet, but, like I said, there's plenty of inspiration in this thread. I'll post a couple of photos when it's done.