I’ve had one. Two actually…
Mystique 1
Mystique 2
First one was (obviously replaced) with the second frame. Had some paint fall off the chain stay on that one (Sent it back, PX weren’t interested).
Second frame then started cracking around the BB just like the first (only sooner…) – was actually worse than the picture there as that was ‘early’ on – probably had about 3-400 miles on that frame when it went back.
In fairness – Planet X were pretty good both times with the cracked BB shell. Oddly was told that they weren’t getting any more in stock, so ended up refunding me the frame price (though not what the frame is going for now). Was a bit surprised to see new ones for sale.
I actually really liked the bike – pretty responsive, loads of tyre clearance for 700 and 650, threaded BB (lol…), cable routing wasn’t horrific. If I’d been offered a replacement frame the second time, I might have considered it, but had decided on a Ribble CGR SL by the time they’d worked out what they were going to do.
Any questions – just ask. I’ve plenty of experience building up the frames 🙂
Rich