Pond Boss Forums AERATION Systems questions 8 acre pond at 10,000' - lots of aeration ?s

JKB are those the ones they have listed as "pistons". Right under rocking pistons on their site? If so, in the desciption they do say

"Gast Piston air compressors and vacuum pumps are built to withstand the most rugged operating conditions with corrosion-resistant materials used for critical internal parts. Ring design provides consistent flows throughout the service life of the unit"

From a couple quick searches, the Piston Model 4L seem to cost about the same as the comparable rocking piston models 75R, they are available in 24V BUT they do not say available in BLDC. IS the BLDC option a big enough factor to stick with the 75R?

Edit:
Attached link just for reference
http://www.gastmfg.com/product_overview_compressors_pumps.aspx