The bump is small, but I personally like the green lock on my site but there are a few things to consider:
Pro:
- trust
Cons:
- Speed, unless you have SSL on hardware you site will load in over 3 seconds no matter what caching you do. I use cloudflare, cloudfront, W3 Cache and CSS, JS, HTML minify.
You can use WMT and confirm your new domain (https) and send a move domain request, takes 3 days to propagate. It's also quite cheap, I get mine from Namecheap, when you register a new domain you get SSL for 2$, can't find it cheaper than this.
Overall I haven't seen that much movement to have it implemented on all my sites, especially when AdSense will show less ads (they have to come from SSL site as well), so if trust is what you are looking for then go for it, otherwise don't, there are lots of things that can and will go wrong.