Shortly after buy, faucet would come on by itself. Had to break the circuit from the battery pack and then it would work again for awhile before it might turn on by itself. Faucet software seemed to get mixed up and not work correctly whenever we had guests and would help do the dishes. Delta sent a replacement battery pack and problems were solved. 

Secondly Delta says AA batteries would last 2 years. We barely get one year on batteries. Batteries need to be change way too often.

Now after 2 years, the faucet just quit working. No water would flow after the faucet had been working fine for months. Replaced batteries and still wouldn't work You can't even get water from the faucet on a manual basis. Poor design concept.

Also, the instruction booklet has no information on troubleshooting the system when it doesn't work correctly. Overall I am not thrilled about this Delta product and will probably quit buying Delta products.