I am currently using the Nexus 4, Nexus 7 (2012), and the Samsung Chromebook as a youth pastor. Quite frankly, 2 out of 3 are still running with the big boys.
This is a concise review of older tech. For those who don't need the best, but want good.
The Nexus 4
The N4 just got it's Lollipop update, and it holds up to the best of them! Just download the Google Now Launcher from Google, and your phone is going to last you a few more years. The N4 also works with wireless charging, and if you root, you can get LTE. The screen is still very high quality looking, and the battery (seems) to run a lot longer since 5.0. Why update? For a bigger screen or fingerprint scanner? No Thanks!Bottom Line: This phone may be coming up on three years old, but it still plays with the grown-ups.
The Nexus 7 (2012)
The N7, having come out at the same time as the N4, was a great device. But it has signs of aging. Yes, it gets it's Lollipop, but Lollipop and the first gen N7 do not get along. It lags right out of the gate. The Google Now Launcher is slow. I've read that this is because of a bad SD storage setup. But really... why even put out Lollipop for it? It was showing its age before the update, and it just shows more. Battery life is good. And the 2013 version holds strong. Very strong.Bottom Line: This tablet is old. If you are going to do anything beyond having a glorified e-reader, it's time to upgrade.
The Samsung Chromebook
Out of the gate, this Chromebook set the standard for cheap Chromebooks. It had good battery life, great screen, and was fast. And it still is. I do my photo editing on it, as well as basically anything I want to (less high end video). This Chromebook, though a couple years old, can still be bought in stores, and if you find a smoking deal, buy it. But there are current gen Chromebooks for $200-250 that have better specs.The Bottom Line: The Samsung Chromebook is a great computer, and it will be for some time to come.