Piece work for installs

Employer is moving to piece work pay for installs: Lead gets a piece work (doesnt split) and helper is hourly

They said it will look somehting like this:

4" filter install add on $60 (1 hour allotted)

Humidfier install add on $60 (1 hour)

80% furnace $360 (6 hours)

90% furnace existing flue $480 (8 hours )

80 system $600 (10 hours)

90 system new flue $840 (14 hours)

Do you guys think this is a good deal or should I start looking

Added info: $30/hr base rate for shop work, drive time, and loading up/unloading.