Over the last month, I brought out my older Galaxy Tab 10.1 (wifi only). It is a decent enough tablet, one of the earlier Android models. When I got it, it was running Honeycomb.
To be perfectly honest, however, it was always a bit sluggish and lagged quite a bit. I had hoped that the upgrade from Honeycomb to Ice Cream Sandwich would help, but it didn't, not really. Then, I watched Jelly Bean come out, but it never came to my tablet.
I kept using it, but it was never turning into what I had hoped: a tool to help organize notes, review information on the run, and keep track of my cases. Yes, it could do it, but it was sluggish and the writing apps weren't all that great.
Then, I watched OneNote come out with its handwriting addition to its Android app. I was excited for what it could do to my tablet. When I went to the Play Store, it was not available for my tablet, which was running Android version 4.0.4.
Almost ready to give up on my tablet, I came up with a new plan. I rooted my tablet and installed CyanogenMod 10.1. All of which was absolutely free and not terribly difficult to do.
Now, I'm running Android 4.2.2, and maybe it's just wishful thinking, but I think the whole tablet feels a little bit quicker. Plus, I can use OneNote again.
So, if you've got older technology (yes, I know, a 3 year old tablet isn't that old in the grand scheme of the cosmos, but it is in terms of early tables), before giving up on them, there might be ways of scraping a little more life out of them.