Is using Clear Wave PR a good idea?

[Glowstone]

Hi,

I'm running a crowd-funding campaign in the UK for a self heating china smart mug and Im struggling to get exposure in the US. A PR agency called Clear wave PR have phoned me a couple of times and I'm thinking of using them. Has anyone else used them? Is it worth doing?

Thanks

Thomas
Glowstone heated smart mug - fine bone china

[Glowstone]

Sorry, they are actually called 'First wave pr'