Any opinions on the eAR digital "Ice amp"

I have the eAR Two (2-channel) amp, and I concur with Daniel and Ramy. If you can forgive some of its ergonomic quirks (like the connector "cave"), then you'll discover that it is an excellent sounding amp. Peter has since re-designed the connector layout, so today's amps are altogether more user-friendly. I'll add that if you value a sound that's transparent, neutral and 3-dimensional, then this amp deserves to be on your short list. However, if you favour a more overtly euphonic or "warm" sound, then you would be best served by looking elsewhere.

With all due respect to the H2O, I'm sure it is a fine amp but there is currently another thread dedicated to it. Let's allow this thread to remain on topic.

The eAR 202 and 501 are lower cost alternatives to the eAR One and Two. The main reason they are less expensive is that they use ICEPower ASP-series modules, which contain an integrated switching power supply, unlike the A-series ICEPower modules (like those used in the eAR One and Two) which require an ancillary power supply. Another reason for the price disparity is that the ASP-series has built-in short circuit protection. The A-series does not, so Peter developed his own proprietary circuit, and the cost of this development effort is reflected in the eAR One/Two's higher price. I understand that Peter modifies his ICEPower modules for improved performance, but despite this he'd probably concede that the ASP-series modules still don't sound as sweet as the A-series based amps. I haven't heard the 202 or 501, but I admit that at their prices I'm tempted to try one of them in a second system.