I used Cape Bike Travel to rent a F700 for a day.
Called them about two weeks in advanced, booked the bike, quick and easy.
Rate was the best I could find, staff were pretty friendly.
Only niggle was the bike wasn't full. I had never ridden one of those before and was unfamiliar with the fuel gauge. I should have questioned it, but didn't. Got from Cape Town to Franschhoek on what was in the tank.
My bad for not querying it. Their bad for not saying "Oh, by the way, the tank isn't full."
http://www.capebiketravel.com/rentals.phpThey are in Cape Town, City Center.