It's hard to find reviews of Custom-1 and Custom-2 so far.
Wildflower did some very nice reviews in French that you can translate online etc. if you don't read French.
Atrio M8/Custom 1/ATH-CK9/Q-Jays/Westone UM2/Triple.Fi 10Pro
Custom 2 vs. Custom 3 with mention of SE530 and Triple.Fi 10Pro
He liked the Custom 1 against the competition. Hard to tell with the Custom 2 because he was comparing it to Custom 3, SE530 and Triple.Fi.
PRICE CHECK: Custom 1 was down to $91 on amazon.com (authorized dealer) but they don't sell it directly anymore I guess. Custom 2 is $162 on amazon.com.
DISCLAIMER: The only ones of these I've heard personally are Atrio M8 and SE530.