I finally got around to performing some upgrades on my late 2010 Macbook pro. What prompted me was the battery finally dying and no longer charging, requiring me to open it up anyway to change the battery. Got a 240 GB SSD and bumped my RAM up to 8GB. Wow, my MBP is now running Sierra very well. Boots up in under 20 seconds, apps open almost instantly, no beachballs, and overall everything is much snappier. It's like a new machine. And this reinforces my hesitance to upgrade to the newer MBP's. To swap the battery, drive, and RAM took less then 20 mins plus the time to install the OS and migrate data to the new drive. For less then $300, I have extended the life of my already 6 year old MBP for several more years to come. I could not be happier.