In reply to SteveRi:
I got a s/h 36/50 Stronglight Impact off fleabay for my winter hack to replace the old Campag Daytona 39/53 it came with. I'm getting too old to push big gears! My old 9 speed Veloce rear mech has a short cage, and the front changer has a max tooth difference of 14. The rear cassette is a 14-28
If I'd gone for a full compact setup I'd have had to change the whole transmission, so it was the cheapest way do give me a better spread of gearing. All I needed to do was take a couple of links out of the chain.
My good bike has a full 10 speed compact setup - 34/50 and 13-29 cassette so I've got some lower gearing when tackling longer and steeper stuff in the summer months.