I don't have one nut I've looked at the spec and it's described as having a "semi metal chassis". Now if that just means it's a metal chassis with a plastic outer then that's fairly standard. If not, then you might find it doesn't last very long and, at £500, you would be hoping for a sturdy machine. I would be looking for a teardown to see what the deal is there. Will you really use all those Stitches?
Ergonomically, those pretty curves will make it harder to sew straight. Singers have the same issue. You want the weight of your fabric to be supported evenly as it's fed through.
The top speed (600 stitches per minute) leaves a bit to be desired but is less of an issue.