We have used the services of Focus since acquiring our first two BTLs in 2002 (we now have 3) and we have never had any cause for complaint. We have always found them friendly and efficient and have not experienced long voids. Any part of the deposit which has not been returned to tenants has been a small amount for cleaning if the property has not been left in the same clean condition as it was when the tenants moved in - this has hardly ever been necessary as we have found that most tenants provided by Focus have been excellent. All deposits are now registered.
We would definitely recommend Focus.