I've got the CO toy, and it's not bad at all. Not really what I'd call a "replica", but it's definitely not bad for just playing around and sonic-ing the remote control when you're watching the show. I've got a CT on the way, so I'm not that worried about upgrading the toy.
The 11th Doctor's screwdriver, on the other hand.. I finally pulled that one out of the box (now that I've caught up to the 11th Doctor on my trek through the series, I kept it boxed up until then), and it's rubbish.. I'll definitely be doing something to that one.