I've read in some previous forums that the Silk Performer tool can be used as functional testing tool.
Is this ok? or there is any other more suitable tool for functional/ regression testing in the Silk suite?
it *can* be used for functional testing remote (http) API's or sites, but I'd prefer other tools/options.
In theory you could use SP as a functional test tool, the problem is the tool only basically cares if it can get from point a to point b.... So it will only be high level...
But in the end doesn't it all come down to BEER? Beer is the ultimate answer to all questions in the universe so yes the answer to your question is BEER.
I'm downloading SilkTest trial. I think that one is more suitable for functional testing based on what I've read.