Loft maybe sails maybe? Had them for some time now in the Oxygen2's, cant complain about performance nor durability. Did hear we are behind in receiving the latest for a full season, but cant verify as haven't purchased for a while. 2011/12 sails still all good.
I've sailed a Legacy 6.5 and a Gator 6.5 a fair few times. The Legacy was definitely better built and nicer to sail in my opinion, it got going quicker and felt like it had a more even pull.
I purchased a 6.7 Severne Convert 4 years ago. The sail was ok, very basic performance sail. After about 20 sessions, the batton pocket toward the mast started separating. Sent it back for a free repair, then it held pretty well. The sail is just cheaply made, from thread, stitching and quality. I wouldn't recommend it.
I just bought a 2016 Ezzy Legacy and took it out of the bag and what a difference in quality. Night and day compared to the Convert. I haven't used the Legacy yet, but I can just tell it will perform and hold up better than the Convert.