I have a Amira sl4 expert and although everyone said it was aggressive, it is nothing like the Kuota Kharma I had.

I'm 5'3 (or 5'4'' - no longer sure), and I have a 51cm. Fits perfectly well.

So far, I LOVE my Amira. When you nail that pedal down, you are already far ahead. Hill climbing? No issues. It has so much kick-off. I have no issue with the steering, no issues with getting it back on track if I happen to go over a bump or whatever. Wished I had found this bike before the Kuota and saved myself lots of money. hihi

Everyone love its colour but I totally hate it. Flat black with zebra stripes! For someone like me who likes colour, it's hard to deal with but the comfort of the ride and feeling safe on it, outbeats any colour. I'll just pimp it one day. hihi

But I did keep my American classic wheels that I had so bike + wheels + ultegra, I could certainly not ask for a better bike.

Good luck in your search and as most of us would tell you : Go get your dream bike! Only one life to live. hihi