Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Someone was thinking ahead -- great design!

I recently purchased a 5 year old home where the back yard had never been landscaped.This unit comes standard with three channels.In my case, two channels were already taken with the front yard circuits and I wanted two more circuits for the back yard.When I first noticed I only had three total circuits I was upset, thinking I would have to buy an entirely new controller.Then I saw the locations for the expansion units. Nice!Installation was simple and the module was instantly incorporated in to the programming logic of the unit. I somewhat expected to have to jump through some hoops to get it to play, but, that was not necessary.It is nice to know I can continue to expand this unit at a fraction of the cost of a new unit.I highly recommend this module!