My gut answer is “go for it”
After all that is one of the beauties of this subscription model, and while I have had five test drives (10 minutes - 3x45 minutes) at FCL, nothing beats really “living with” a car for a period.
But I’m conscious of becoming the hippo right (blimey, that’s such a bizarre autocorrect I might leave it in 
) on this subject as, after four months, I’m the one dithering over my next switch just to shave a little cost off the addictive Kona Ultimate! 
I’ve got my 6 month reward bonus in the bank, and used points on my first swap in January - all very painless!
I jumped onto online chat to make sure someone pushed all the right buttons at HQ