Another discount code bought £640 on-one pink fatty owner here.
Bought as a “well if i don’t like it I can sell it on for the same” punt, and it currently remains the most used bike from my varied stable despite the new-bike-itus now being worn off.
I advise you save a little longer to get a decent one rather than a weighty boat anchor. You can and will ride anything on it, but best not go out with your fast mates on whippet bikes. I also advise that if you get an On-one fatty you start saving for some carbon forks soon after as they feel good on it.
Andy