The flirty funk of Howling Diablos, and the Abercrombie selection, with it's humor and shrewd production tricks, are the highlights. You can do without the Mention and Zero Parade. My suggestion to Spa would be to get more diverse. Find some pianist, some old torch-song singer. There's plenty around.
Most tracks here are somewhat redundant.
The collection is well intended. The groups on it are touring the country together, visiting each act's hometown one by one, in order to spread the good word. More information at the Spa Records website with the annoying cursor-following thing. It still seems a little homogenized though. Eclectic Nobody's, Lance Stevens Band, Big Sky, Ode to Abbey.