The only think to worry about is if it cranks the Server CPU usage up in way such as constant editing/running of MySQL/Cronjobs which it doesn't seem to do at the look of it. I don't see any problem with it.
When I read that it uses Silverlight, I was expecting an animated site, something like a Flash site? But when I accessed the link and checked out the demo, it seems like its not very animated. The links are not like Rich Internet Applications where interactions are instant, rather than reloading a page. Probably extendable to do those, not very sure though.
I don't think Silverstripe uses Silverlight.
Atleast I couldn't find anything on their site which indicates otherwise.
I would try it out. Besides, if a script is resource intensive (unless it's so heavy it doesn't work) is only important if it gets a lot of traffic. If you get less than 100 pageviews per day, don't bother optimising it or worrying about it.
Back to the original comment...
SivlerStripe requires MySQL 4.1 and the server I'm on (2, the DirectAdmin one) only has 4.0.
So it looks like this is a no-go unless there's a MySQL upgrade coming any time soon? I don't know if the other servers are any higher?
An account on a different server would be great if it's not much trouble. I never use the subdomain anyway, besides the Silverlight questions were in aid of entirely rewriting the thing with a different registered domain entirely! So none of this is an issue.
Nothing on my account at the moment is needed (including databases) so feel free to nuke it - no need to transfer anything!
It's not that it doesn't work - it's more that it will refuse to install if it does not meet those requirements.
I'd be interested in knowing how you got it to work though if you can remember.