I can't because RedShop doesn't offer Joomfish support - and is therefore not an option for any multi-lingual e-shop. And that's a major flaw that should really subtract more than one star off this rating.
But I'll leave it at that, hoping that the developer will very soon realize that multi-lingual support is a prerequisite for any commercial e-commerce software aspiring to becoming "first choice".
We are talking with Joomfish about it for the future :)
Installation and configuration is pretty straight forward and if you run in to trouble there is savvy and prompt support.
Thank you for this much needed extension!
And it comes with professional and dedicated support by the developer.