I use Marketwire to distribute news on behalf of clients in Canada on a regular basis (once to twice a month). I would recommend the service: I typically see between 5-10 additional pieces of coverage that I wouldn't otherwise have achieved on behalf of clients without using it. This specifically relates to news sites such as Yahoo, Reuters and CBJ that rely heavily on content from the wire.
The team at Marketwire are fantastic. They are responsive, helpful and accepting of the near impossible deadlines that I sometimes have to throw at them.
I have recently had experience of using a competitor's newswire in the U.S., and it highlighted how effective Marketwire Canada is by comparison - and how much better they are at generating coverage.
Marketwire has recently moved to an online system whereby the user (meaning me) goes through an online system to set up the wire distribution. I'm still a new user of the system and can find it difficult to navigate.
That said, when I've had issues with the system or tight deadlines to work to, the Marketwire team have been quick to help and set up the release for distribution on my behalf. I appreciate this level of customer support.
I use Marketwire to make my news releases reach a wider media base across Canada. There are certain websites that heavily feature stories from Marketwire - such as Yahoo, Reuters and CBJ. Even by telephone and email pitching, there are certain outlets I'd struggle to get coverage on in Canada without using the Marketwire service.