Can someone with SilverStripe experience suggest how it might work as a community software site with visitors able to register, add comments to blog entries posted by others, add short news items (quick hits), add blog entries, add events. Basically how it compares to BuddyPress and WordPress with multiple blogs. For example, what's native in SilverStripe and what requires plugins and/or widgets.
I'm also interested, in general terms, how SilverStripe scales over time, no such much the marketing hype but more how SilverStripe code works as page loads increase, as the database might move to its own server, and the like. I'm familiar with WordPress, ExpressEngine, MovableType, and other CMS software over many years. I'd like to know how SilverStripe compares, in your experience and opinion.
If you have any ideas, thoughts, warnings, I'd appreciate it. Honesty also is even better. 8-) Thanks!