I have come to really dislike the "floating lid" concept.  I have that setup on 3 of my mid-sized packs (a Mountainsmith, and two Gregory packs).  The damned top is always falling off the back whenever I just want to open the main pack for a second or two.  It is also a nuisance to readjust the lid attachments when you change the load.

Givel me an old fashioned sewn on flap top anyday.

A bag is a bag - a lot of what you would be paying for with that Nimbus is all the buckles and D rings that stick out all over - a nice addition if you will make use of them, but otherwise, just useless added weight and cost.  Looks like a nice comfy hipbelt and shoulder straps - sew on the lid, cut off most of the excess attachment points, and I'd like it.