The Iceman will get hot, same with the AEM and most any other intake. However, it's due to the outside temperature of the air. A hot day in Las Vegas will make your Iceman or AEM very warm to the touch (hot, but not enough to burn you). Drive 5 hours back at night to San Diego, and the Iceman and AEM will be noticeably cooler than during the day. Anyways, the intake pipe will generally be about the same temperature as the air being ingested.

For sound, I only have experience with 5G Civic EX/Si's (D16Z6 engine). The Iceman is noticeably louder (both as intake only, or intake/header/exhaust) than the AEM. Both have noticeable power spikes that coincide with a louder engine note...the Iceman at 4400rpm, the AEM at 4700rpm.

The AEM lost 1-2hp below 3500rpm, and increased peak hp by about 2hp. The Iceman had no losses, and peak hp was increased by 3hp in both underhood and CAI configurations! However, in CAI, the Iceman has a peak gain of 6hp at 4400rpm (which coincides with the louder engine note).

On paper, the Iceman definitely has the edge, but in real world daily driving, there's really no noticeable difference besides the noise.