I made this switch in June. I was riding a Trek 5200 WSD 47 cm with 650 wheels. My new Kuota frame is a 50 cm, with a very short, sloping top tube and 700 wheels. At first, I also felt like my bike was giant, high up, even though I felt fine riding it. The turning radius also was different and I'm not too swift with those kinds of changes. But, now it feels normal. It took about 2 weeks.