Never had more than one at a time but been through a few....
Handbuilt converted shopper bike with seat made of two bits of plywood and some foam. Did me a tour round Norfolk (about the flattest county?) but weighed a ton even without panniers. A lot faster than my MTB...
Flevobike racer. 17kg, but could be ridden hands-off (good for carrying parcels, as in literally carrying!), and very aerodynamic; did my first 100-mile ride on this. Tight turning circle but not good for quick reactions/adjustments; quite a handful in town. Good for core strength!!
HP Velo Grasshopper. Suspension good, compact - fitted in a standard bike space, unlike most, due to the small wheels. Not the fastest but would go places many wouldn't, versatile, comfortable.
Bacchetta Giro 26. A bit lighter, felt a lot lighter; faster, less clunky, but "stick bike" riding position and handlebars not as comfy for me. Took it to the Peak District and hit 50mph downhill...but boy was it tough going. Handled well.
M5 Carbon High Racer. A Rolls Royce for the open road; smooth, light, responsive, stable, sublime ride - fastest bike ever. But long wheelbase - manoeuvrability limited, hard to look around, not good in urban situations, hard to store let alone transport. Looking to pass on if anyone's interested...
Hard to see where I'd go from here. Kinda wish I'd gone for the M5 "M-racer" for its slightly more compact form (and hand on floor); would enjoy the flevo as a fun thing/challenge rather than necessarily a serious bike. Cruzbike maybe but the steering geometry looks.... different!!
