I have an early 2011 MBP 2 GHz i7 with 8GB RAM and 130 GB free on my 500 GB Hard Drive. I'm running 10.11.2 without any noticeable issues. I've had the Hard Drive replaced after a failure a few years ago and the GPU repair last year. I could probably free up some HD space by moving videos and pictures to my Time Capsule, but I'd rather not if I don't have to. For the most part I don't have any issues with this computer. I mostly use it for internet and various classes. It boots slow, but I don't reboot it that often. The battery is the original, but it's usually plugged in. I don't travel with it all that often. I've been getting the beach ball a little more frequently and it "freezes" from time to time. Due to it's age, I've started to kick around the idea of a new laptop. I probably don't need a MBP based on my usage. I was looking at a MB Air, but the HD doesn't seem that large on those. I've also considered bumping up to 1 TB SSD and 16 GB RAM on this machine. I don't know if that's worth it due to it's age. I don't keep up with computers like some of you do, so I thought I'd toss it out here for some advice. Is it worth upgrading this machine for under $500 bucks, or I'm I just wasting time and should fork out the $2000 for a new machine? Suggestions and products are greatly appreciated. Thanks!