Well, funny this post should come up when I happen to visit Head-Fi again
I actually did end up flying from Vancouver to Scotland, and back, my total bill for the return flight, after tax and cancellation insurance came to $699.55 canadian, and the flight went well. Granted, I have nothing to compare them to, except for crappy-ass RyanAir (super-discount airlines within Europe - 2 return flights tickets for Scotland to Germany came to $105 canadian all together after tax) I found it a good experience with friendly staff and everything. I'm sure flying with a more expensive airline would probably provide you with slightly better seats, and a bit more comfort/luxuries etc, but they are also like 50% more expensive. Having taken them, I would definitely take them again if the opportunity arises. However, having nothing to compare them to, I can't give my opinion on whether I recommend it over other airlines or not, but just that I had a good experience, nice staff, fairly smooth landings, and all at a price that was very easy on the wallet. And that's coming from someone who generally doesn't mind spending extra on quality, so it's not like saving a few bucks is top priority and colours my opinions of the airline. Hope that helps.
[edit:] Just wanted to note that my $699.55 total was when the tickets were advertised at "$199 each way", after adding all those extra charges and fees and also after cancellation protection (which was about $30 or 40) and after gst and pst, it was $699.55. Their prices are not *always* that low, but they quite often have $199 sales so keep an eye open for those.
