The thumbs-up symbol marks those companies that are highly recommended. These firms have a solid reputation for quality and service.
that does not have the thumbs up symbol. They may be just as capable as
the highly recommended vendors. Most likely, I just haven't heard
enough about them to know.
There are perhaps two or three companies I would definitely not recommend.
EuropeThanks to Stephen Tonkin for the UK listings.
Thanks to Wolfgang Birkfellner for many of the European listings.