The corvette that runs around with the euro cars costs a wee bit more than $48K....I have one its more like...$77 - 100k....Corvette that is....
I have several Schiit amps...and have an O2 Objective amp. I have 50 hrs now at least on the O2 and hundreds on hours on the Lyr and Asgard with Audeze LCD2's, AKG 701's, Grado 325is and AudioTechnica 50's...
Its very, very refreshing to see an objective minimalistic approach to designing a headphone amp...the O2 provides a very inexpensive amp that does measure well, and its design has been published for all the world to see. You dont see that from many vendors.
This doesnt mean that other vendors make less than stellar stuff. You can pay lots of dollars for stuff and get good measurements and sound...and you can pay lots of dollars for stuff and get less than stellar results but the stuff might weigh alot or look good.
I like using the least amount of stuff on the straight wire with gain challenge.....the less there is the less there is to get in the way...and objective measurements go a long way in level setting.
I have purposly not mentioned anything about how the O2 amp compares to the other amps....dont want to run this thread in the wrong way. If you want that information PM I will be glad to share my experiences with anyone.
That said for $144 the O2 Ojective amp is a "steal" for what it does and does not do..
All the best