Hey bokat57, I just posted a (rather lengthy) review of the Torii Jr., but let me answer your questions here as best I can.

As far as resolution, I feel that I hear every single thing that is recorded on the source. This includes tape hiss, background coughing, noise, etc. I hear when the bass is overdone, and when the singer breathes in and out. I hear the attack and decay of a plucked guitar string, and the clicking of the parts of a saxophone when its being played. Any vinyl records that have been uploaded to youtube for example that have even the smallest scratch come over the speakers loud and clear---so much so that it made me realize that I'll probably never be able to stand owning a record player. If it's on the recording, it's coming through the speakers loud and clear.

I don't have a music collection per se (other than some misc. CDs collecting dust upstairs). All of my listening comes over a network audio player (a Marantz NA6005), which allows me to listen to, among other things, internet radio stations, anything on a computer that's hooked up to my wifi network (I haven't tried that yet), and anything that I play on my iPad or iPhone via Airplay. I prefer to listen mostly to internet radio, as I feel that having a collection limits me to having new listening experiences. (Hell, I'm even listening to opera in the morning. This thing has completely screwed me up apparently).

I can distinctly and without question hear the different line levels that each station is broadcasting in. I also hear which ones (like my local NPR jazz station) are bumping up the bass levels to, perhaps, make themselves sound better through a car radio. Is it distracting sometimes? Yes, but I also feel like I'm not missing a thing, good or bad. I can also hear that youtube music is dynamically limited compared to the internet-radio sources. And those are probably limited with respect to CD players or master tapes. I've yet to buy a CD player to make up for this "deficiency", and anything on those CDs are probably available on youtube or iTunes should I feel so moved to buy something (I haven't).

I wouldn't say that some music has become unlistenable (other than those scratchy records mentioned above), just that I don't expect to hear a Louis Armstrong recording as if it was recorded in the same studio/same equipment as Metallica's newest record. This gives the music a sense of time and place that is . . . "appropriate" for lack of a better way to put it. It'd be weird to see a perfectly clear 16 megapixel image of Abraham Lincoln, for example.

As far as heat, this isn't the amp you want to chill your beer on. It will probably keep your coffee warm if you wanted to balance your cup on the power transformer, but I'm not saving money by turning off the house furnace either. After reading the manual, and re-reading it, I know that Steve designed the amp to run hot. That said, I don't try to see how long I can keep my hand on the transformer from time to time (not long by the way).

I have zero regrets buying the Torii Jr. It has as much or more resolution than my Super Zen CKC, which has not been reconnected after getting the Jr. in the mail. Hope this helps.

I don't think it will have that great of an effect so as to cause your room to become noticeably warmer.
It also depends on tube choice. I am running 807's right now and the amp is just warm, not hot at all.

Short answer is it is honest, open, clear, fast, wide, tall and deep.
I fought for a long time with several different brands and types of gear to get as honest a playback of the source as I could.
This amp will reveal the differences with tubes and cable choices, as well as everything else you try, allowing you to really fine tune your system to your liking.
It is a fantastic foundation for a system.
It gets even better with age which is great also.

Thank You Both for helpful thoughts on this matter !

Thanks for your thoughts Tommy Freefall

Something else to consider.