Is this tool any good?

Aw c'mon it ain't that hard! Attach 1 foot of hose to Prestone fitting, disconnect one end of heater hose without cutting, insert fitting w/hose, connect garden hose and pollute storm drains til your hearts content. Remove and refill with coolant.

The Prestone kits went away a few years ago, about the same time we started caring about the crap we were dumping intoo our river via the storm drains. I still use one, but caprure my runoff and route to sanitary sewer.