Unlike when I first started to buy WFP gear we now have a much wider range of choice which can only be a good thing so I know where you are coming from
Gardiners seem to have a good reputation but I havent dealt with them so I can't comment on their goods or service.
I have and still do deal with the Purefreedom guys and can only say that I am 100% happy with them and their products. I have bought the trolley and tank systems from them.