I didn't actually respond to the email, but I want to be able to see Silverstripe represented and featured a lot more in reports [url=http://www.cmswire.com/downloads/cms-market-share/]like this one[/url] next year. I've attached the report to this post, but if you can't be bothered looking through it, check out [url=http://buytaert.net/open-source-cms-market-share-report-2009]this blog post[/url]. Silverstripe ranks 4th in terms of the general feeling towards the project being positive, but lacking in familiarity, and as written in the full report, really struggles to convert users from 'testing' to 'using'.
I'd suggest checking out the report though. Its quite good information, even if just to look at the graphs :)