I can totally play skeptic :)

So like I mentioned in the description it really all depends. If your cache store is already really close to your application like on the same server, you aren't likely to see much gain since fetching from Memcached doesn't even go across the network. But using something like Heroku where your Memcached server might even be on another network that's not Amazon's you'll see some nice benefit not having to connect to that Memcached server sequentially.

Also I rendered out 50 items from Memcached in the test app. Your use case might be a lot less, or even a lot more.