I have owned a ICOM R-100 (un-blocked) receiver for a little over eleven years, purchased new along with it's matching AC supply. I have only used it my at home, never mobile, and have had very good luck with it. However, I do NOT use it as a scanner, just listening to a local six meter repeater and sometimes my local FD. The reason being is that it scans slow and when it changes frequency ranges there are internal relays that switch on and off, much like in the R7000 and R7100.
The radio has all kinds of features, a timer, display dimmer, a preamp/attenuator, N-connector for high frequncies, etc. It is very well built and is heavy, all in metal housing. Very sensitive on low band and high band and UHF, I have never used on 800Mhz or shortwave either.
Like most Icom's, it has a learning curve. Nothing about it is intuitive. Programing, and overall operation is somewhat awkward. The squelch control feels cheesy. It feels like the potentiometer is mounted on the circuit board with a long plastic shaft extending through a hole in the front panel, not supported by the front panel itself. It feels flimsy. Poor design for such an expensive radio. I see many go back up for sale a few weeks after they're purchased.
Performance is ok. The big attraction to this radio used to be because most were un-blocked. (The blocked ones also block out portions of the 800MHz band that are not required to be blocked.) Another plus was it's small size, and wide-band capability.