From SpiralHosting's own site: "Spiral Hosting Limited is a privately owned business that was founded in December 2006 after Managing Director Peter Armstrong, acquired the hosting business that was formerly FastProvider.ie. We are based in Belfast and Dublin, Ireland. We've worked in the industry since 1998 and approximately 65% of client base are European. Whether you need web hosting for a blog or small website, business-level hosting or server hosting solutions for your organisation, Spiral Hosting offer super-fast and reliable Internet hosting solutions with extremely competitive pricing."
For all but the most insanely high-traffic apps, the best Ruby on Rails hosting solution these days is a combination of Amazon Web Services, Heroku, and a shared host like DreamHost.
This is because you should serve all your static assets from CloudFront and use SES for outgoing email. Your application layer should sit on Heroku (until it becomes crazy expensive), and your inbound email server, domain redirects, and miscellaneous stuff should be on a shared host.
TIP: use the promo code RHPROMO to get $30.00 USD off at signup with DreamHost.