I measured myself solid-state "opamp-replacement" from BURSON: V5 and V6 and found no flaws. I used RMAA, ARTA and scop. Also, did compared results against regular opamps like NE5532 and similar...depending on the stage used, BURSON was measuring sometimes better, sometimes worse, but most of the times all tested opamps were measuring about the same. E.g.: In I/V stage of PLAY DAC, the V6 showed a tiny little increase of THD, but in GAIN stage of Objective2 I got a tiny little lower background noise (a better SNR).
Under no circumstances V5 or V6 will oscillate, nor induce distortions, at least not in my devices.
The only downsize I found would be the price and the output DC-voltage (this might affect output-DC of some amps or DACs, depending on the design; however, found no issues with all of my tested devices).
I do hope Amir will be able to test the V5 opamps within couple of months. Even if V5 is not in the same league with the V6, I found it a good match for the gain stage of my Objective2 headamp, but also in output buffer of my ASUS Essence One combo; too bad I can't close the top case, so...can't use them.
L.E.: Solid state opamp-replacement are for those people that really don't want opamps in their audio devices. No matter the manufacturer, the schematic is optimized for audio-use only and also for unity gain. However, depending on the internal design of the audio equipment used, there might be incompatibilities, of course. Also, if best measurement numbers are needed, then feel free to choose OPA1612, OPA1652, MUSES8920 or similar; don't use solid-state "opamps".