I have used ducksback covers on my various boats for sometime now and have been very impressed. I know some people dont like them but I recall questions being asked about them in the past.
The cost between about £50 - £100. are very light weight, easy to get on and off and I think fit well for a non bespoke boat cover. From my experience in the UK they seem to last between 3-4 years which for the price I feel is very good. I have just bought one for the Honwave T40 and also treated my Narwhal to a new one.
Here is a little video that might help others to decide if these covers are for them.