I had not! I shall add it to the list for comparison, so far I have
GMG Daniel Boone (£800, max 260c , 458 sq.in)
Traeger Pro 575 (£800, max 232c, 572 sq.in)
Masterbuilt 560 (£700, max 370c, 560 sq.in?) This is charcoal, so I guess a different flavour?
Have you seen the Masterbuilt 560? I've seen a few people talking about it and it looks pretty interesting.