Even just notes on feasible latency numbers in milliseconds?
Focusrite doesn't print any stats on this issue. I wonder why.
Roland quotes 2mS.... wow!
LOW Latency is very important (....Live e-drumming.)
There is very little info to be found on these units. Except: Focusrite has extremely dubious and unreliable drivers - they recommend using no other USB devices at the same time. A shame - it's very compact.
AD Dynamic range:
Focusrite 2i2: 105 dB
Roland UA55: 104 dB.
Mackie Onyx: 114 dB (but this isn't clear if it's AD or DA and it doesn't have 64-bit drivers).
NI Komplete: 94 dB
MOTU Express Hybrid 112db (unconfirmed)