I’ve had a ti and steel 456 and enjoyed both.
Currently I feel that they would be better balanced (cockpit to saddle relationship) if you were to put a 53cm axle to crown length 140/150 fork on them…ie Sektors or new Revs. The Pikes/32Talas and RC41s (all with 51cm axle to crown heights) I’ve used seem to leave the front end too low for me, making the effects of the high bb more apparent when you are chucking it down real steep stuff. There is no false advertising tho, they say from the start that they are aiming to produce an arse up, front down bike. Did climb real good in the forms I had them. Quite possibly a higher fork at the front would compromise that.
They are also quite long, so a size down on what you’d normaly take might be good.
And the seat angle is a bit slack leaving you further back and unless I shifted the saddle right the way foreward my knees gave me jip.
BUT they are hugely capable and I really enjoyed mine(still do….Ti one is having a frame makeover at present tho)
I found the Sanderson Blitz and Pace 303 better at descending and twisty singletrack.