Dear All, thanks to those who responded with advice and comments - I now have a Woosh Karoo and so far so good.
Thanks again!
- It went together straightforwardly - I needed to adjust the front brakes and a few of the mudguard clips had fallen off but otherwise fine
- It's to about the same standard (exactly the same rear mech for example) as my Horizon - I intend to do the same as I did with that one: replace bits when they wear out/break with either the same or better, depending on how good they were (or weren't).
- It's cutting about 15-20 mins off my commute (originally 65mins) - so about 10mins more than my old one with about the same amount of actual effort, which is ideal. I guess I could take a bit more time and waft along fairly effortlessly but haven't felt like doing that so far (only two days in though).
- It doesn't actually feel that different, (except for the initial just-started-pedaling 'kick') but it's clearly a lot faster on average - and it doesn't feel slow or heavy at > 25km/h, which was something I was a bit worried about
- Flat bars were surprisingly "different" to start with - must admit that surprised me
- I'm finding the grips uncomfortable - probably been spoiled by gel and thick bar tape - and also not being about to change hand positions much is a bit annoying.
- I don't use the throttle - not even really intuitively clear what it does (at the speeds I've been going/pedaling, it seems not much at all). So am tempted to remove it (don't believe that will stop the bike working?) and fitting better grips and bar ends.
Thanks again!