Anyone expecting the Icom 8600 or any modern SDR type radio to out perform a old analog radio on low bands will be very disappointed !!
Don't get me wrong I love the new modern take on rigs theses days like IE: spectrum display /IF Out/decoders/ and all the other cool stuff to look at and play with
The Icom8600 is fun to play with but so is a Lamborghini! do you need one?? well If you can afford it sure why not?
To be fair the rig sounds much better then a cheap SDR as the audio is processed by the rig and not the PC However when you run programs like HDSDR or others using the IQ (You just turned your $2300 rig into a Cheap junk $20 SDR ) Don't do that !
Instead Use the IF 10.7Mhz out for spectrum display and 12.0 Khz or 10.7Mhz out for Decoding this works great for programs like SDR#/ HDSDR Ham Radio Deluxe/ CSVUserlistBrowser and others
For those of you that have not figured it out yet Use CI-V CT-17 Cat Cable For ICOM Radio not the USB port as that will not allow you to remote control your radio without it locking into that dam IQ mode
I use this one
(bestkong CI-V CT-17 Cat Cable) I found On Amazon it will allow your PC to have full control without locking your rig up and your audio !
Anyway.... back to my opinion

well am I happy with it, (Yes) was it worth the money?? well.................. its a BIG chunk of $$$$ for a toy with a lot of bells and whistles ,Did I need it ? (NOPE) as I have a lot of radios that can tune to the same thing and the $20 SDR can decode everything the Icom8600 can, But hey its a Lamborghini Baby ! so ya for me ill say (YES)
Now far as the stuff you guys are talking about ( sensitivity ) on the( Low Bands) I just always find it funny how people try to compare a SDR like the ICOM8600 to a real radio sorry to say it but that just cant be done ! here is just one example I have a have a old kenwood 440 made way back in the 80s and it even has better sensitivity then the Icom and much better audio quality ! I know it sounds crazy but its true old analog radios just sound better then the New SDR type rigs no mater how you use all the gimmicks that comes with them the
Sound quality is just not up to par with real radios !! who knows maybe someday ??
Now for VHF/UHF that's another story and I have found the audio quality quite good and better then most rigs and the sensitivity will blow away any SDR/Scanner out there ! You will hear signals that don't even exist on a Scanner radio
The only thing I found disappointing was the lack of DMR decoding however it will work fine using a PC base decoder just use the VSC so you don't hear that awful noise coming out of your speakers
Now I see some of you don't think it will trunk scan ? your wrong it will trunk just fine using PC software however for the life of me I cant get it to decode P25 simulcast on its own However I did get DSDPlus to decode it from the IF 10.7 MHz out
but that s a bit chunky and tying up a $2300 radio to do that is just silly ! LOL
Bottom line if you can afford a expense toy sure why not? but if you just want a receiver you can pickup a cheap used one on ebay and if you need the IF OUT just modify it not hard to do theses days 
73s