I ordered this 9 years ago.  When not in use, I drain the water out of it and leave it outdoors.  It still works perfectly.  About the only thing it cannot do is work in mud.  Mud is what you get if you water bare dirt with no grass on it - once I got some grass growing (9 years ago), it worked fine.  I'd recommend this to anyone.  I loan it out to neighbors from time to time.