I have done a ton of 3D printing. Our makerspace has 9, 2 custom build delta's, 1 boots industry kit, 1 pursa kit, 1 powder printer we are building, 1 printerbot wook kit converted to metal and 3 Printerbot simple metal printers. We bought our first Printerbot Simple metal over 1.5 years ago and it has been rock solid. We have over 50 members and it is used everyday by different people who have there own settings. It's pretty simple to use once setup. Make sure you get the heated bed.
One of our members is a high school teacher who has build 2 Delta printer and has now bought a couple of printrbot simples for his school.
Checkout the Make magizine shootout:
http://makezine.com/comparison/3dprinters/
http://printrbot.com/
You can check out some of our prints here:
https://www.instagram.com/makerspacenanaimo/