In reply to Anthony Hirst:
I have the Wattbike trainer...
Pros, its always set up, its accurate as they come, it turns me inside out in 30 min, ive never been fitter on the bike, i upgraded the saddle to the comfy one and that was a good shout. It links to zwift, garmin, trainer road etc etc...
Cons, cost and space it takes up....
That said it being set up is a huge + as the whole turbo thing was a nightmare for me having to swap wheels and get all the settings right etc. This I just jump on and go. I know my measurements so if the wife or kids want to have a go they can. Yes they are expensive but ive had mine about 3-4 years now and still use it a few times a week if im looking after the children or its raining outside. Not quite rule 5...but cuts down on the colds!