here's an interesting take on changing opamps - i have to agree, once you get to a certain slew rate, the ability to hear the difference is next to impossible. that said, other components in the circuit can affect the audible response and influence our perception. http://nwavguy.blogspot.c...-amps-myths-facts.html
 
also - subjective vs objective. http://nwavguy.blogspot.c...-objective-debate.html

Amicus717
As mentioned above, there are a lot of other avenues I could pursue to improve what I'm hearing in my home studio (in particular, my studio area is badly in need of acoustic treatment, which I think would be a far better investment of time and money).

There's no doubt that acoustic treatment should take priority over hardware mods. However, your original question asked for experiences with BLA. You got a couple of positive reviews from their customers, and some skeptical replies from non-customers. Not exactly a scientific survey, but that's the nature of this forum. Take it for what it's worth.
 
Once you've gone as far as you can go with room treatment, speaker placement, etc., then it would be time to optimize your hardware, including whatever interfaces that fit within your budget. BLA-modded units would certainly be worth looking at then. Have fun!
 
Cheers,
Eddie