the thing you have to worry about is the condition in which the bike reaches you. Have the wheels been checked over and the spokes re-tensioned? Has the derailleur arm been checked and straightened if need be? Any bike in this kind of price range has to be put together by somebody who knows what they're doing, and has the time to do it well. I'm afraid to say that if you're buying the bike by mail order or from
Halfords you may be disappointed.
We compared like for like when we got the kid her Ridgeback Flight 01 (subsequently stolen) and hybrid bikes in this sort of range are fantastic value for money. The one failing is that if you were tempted to take it on a longer run the straight bars do prove wearing on the arms and shoulders.