got one and its been great, the only thing about 700c is being a bit more gentle with curbs and steps but it definatly rolls faster.
I am about 5’7 and ride a 16 inch simple… cant remember what size dew i have, ill go out and have a look for you!
edit- Right i run a 52 cm, and id be wary of going smaller as its would probably feel too short
humm mine is about 3 years old they might have changed the sizing system?