If you're looking for an inexpensive alarm option, I think this is a good one. The system is a bit glitchy though. I've only had the system for a few months, but I've already received at least 4 "keypad is out of range from base station" messages even though the keypad and base station are only 20 feet apart, with the usual interior drywall walls between them. Today, I had what appears to be a false alarm triggered by a motion detector. I bought a system with an extra siren, but I'm not sure of the best way to test whether the siren actually works (the sensors can be tested in "test" mode, but I'm not sure about the siren). If I can get these issues figured out, I will consider this to be a very good purchase. The service has been good. When I have a question, I've always received a response within a day, and the responses have been helpful. The wait time if you call varies a good bit. UPDATE (09/08/2015) After months of "keypad is out of range" messages - one of which resulted in a false alarm- and placing the tower in numerous locations, I may have (with Simplisafe's assistance) figured out the problem. My keypad was somewhat near electrical lines running through the wall. It's too early to know for sure, but after I moved the keypad (and repaired and repainted the wall from where the command strips damaged it), the "keypad is out of range" messages seem to have stopped. It appears that virtually anything in a house (walls, floors, ceilings, electrical lines, etc.) can interfere with the signal, so you might have to try a few different setups before you find one that works, but at the moment, mine seems to be working well.