Does anyone have any experience with these Matala pumps? I am wondering how durable/reliable they might be.

http://www.matalaaerationproducts.com/pdf/rocking-piston-leaflet-2014.pdf

What price range are these pumps in?

I found the 1/4hp compressor only for $397 and the 1/2hp compressor for $615.

Those appear to be standard compressors built by Gast or Thomas. Some companies contract with Gast or Thomas to build in-house name brand compressors. There are some off brands single and dual head rocking comparessors probably availble .