This unit replaced a lower (lowest?) level Insinkerator whose tank was leaking. This was the second tank in 15 years to spring a leak (good for the price paid for the units). Installation was the only problem, and that was due to a lack of space under the double sink with spray faucet, garbage disposal, and dish washer plumbing to contend with. Even then, directions were very good and allowed installation with a minimum of problems. Was actually little harder than installing the cheaper one years ago. Operation since installation has been excellent. No complaints.