Very happy Rose owner here. Got their basic model (PRO SL 2000) last november as a starter road bike. I upgraded the wheels, tyres, full 105, carbon forks, etc. 8kg and only £815, but it was a pre 2012 clearance sale.
They have a flat top tube so a 55cm is equivalent to other companies 53cm. Measure yourself up and give them (or Fin Paton their very helpful UK rep on 07775786709 to see if you’re nearby and try one on for size) a ring to double check sizing.
TBH I use Rose for 95% of my purchases now, I plan ahead and put in an order every other month for all my 3 bikes.
My only advise is unless you’re planning on ordering batches like I do, to also order a spare mech hanger as the postage is ~£7.
[edit]The delivery of the bike itself was mixed, although despatched within a few days it sat in a DHL warehouse for over a week despite having priority postage, but that wasn’t really Rosebikes fault. My last order did that too BTW