I had a go on a brompton, one night outside a pub in Putney , I found it ok ,at that time I only had my MTB ,s/h GT , done it up , loads of fun , I hadnt had a bike for 44 years or so , so yes ! it was a killer in the beginning, I made a point of riding along the river and canal at first, my first 10 miles were to Putney and back ! I went out and bought meself a yellow jersey !!
Was enjoyable , esp canal riding , I would always offer a hand to operate locks with barge people ,so made interesting chat and the ride more enjoyable , I find if there is a purpose to my ride , I enjoy it lot more , I am going to the Velodrome this week , just to check it out ,
Enjoy your riding,