Cannondale Jekyll 800 Frame Size Advice: Will a Large Frame Cause Discomfort?

Question
I'm 5 feet nine inches tall, average build. I am thinking of travelling about 70 miles to see/buy a Cannondale Jekyll 800 - ?50.(2 years old)
The frame is large.
Do you think that being on a large frame will lead to real discomfort/ lack of control? I suppose a medium would be more suitable really.
I'd really appreciate your feedback.  

Answer
Hi Lindsay,

sorry for the delay of my response...my wife just gave birth to our second boy!

I would honestly forget about bying a large frame for that bike.  Not only will it cause disconfort, but it will be a lot harder to handle (gravity center very high for you) and it can ultimatly be dangerous...

Hope this helped...

David