Nice writeup.
In use, the current draw I measured on mine is actually anywhere from 500 -600 milliamps depending on the amount of backlighting, which can be turned off completely. HOWEVER, I registered a quick 2-amp spike at power on, so yes, a 3amp supply (or a good battery) is recommended.
It is not an R75, but I suppose if you need custom filtering bandwidths, the filters are easy to replace if you have GOOD desoldering equipment. I put Collins mechanical filters for ssb and cw into mine, although in reality, I was quite happy with it stock.
For those that want to quickly spin around the bands with the vfo, you'll be in for a shock. You cannot change the step rate of the vfo knob, which defaults to 0.1khz for ssb/cw, and 1khz for AM, and 2.5 khz for FM. You CAN however, change the default stepping rate for the up-down buttons. That is about my only major gripe, although with the slow vfo tuning rate, I'm not skipping over weak stations like I used to.
Narrow AM filtering uses the 2.4khz ssb filter (Murata CFJ455K-5) which is usually too narrow for most. However, you can off-tune it by 1khz or so to get the fidelity back, albeit with a little loss of signal strength. OR, you can purposely go into SSB, and use that for narrow am. Choose a sideband, zero beat the signal (easy to do with the slow vfo knob) and it works very well for ECSSB mode. I suppose you could change the 9khz am filter for something smaller, say 6Khz Collins mechanical if you really want to, but this could potentially affect your 10-meter FM monitoring, so keep that in mind.
For CW ops, the Murata CFJ455K-8 ceramic filter is a 1khz bandwidth, and narrow cw relies on a narrow 500hz audio filter. I really like that setup - 1khz is great for band scanning, and the narrow audio filter really does work without too much ringing - although in a contest you may get some agc pumping. Again, the cw filter can be changed to your liking if you want to. (Like Collins mechanicals from Inrad or elsewhere)
Display is great, although the buttons are kind of cramped. You get used to it. Yes, the RIT button gets in the way but the easy fix is to stop grasping the knob and man-handling it. Use the edge or dimple. Encoder action is very smooth and there is very little drag on the VFO.
Common issue for some was the slightly loose or clicking knob. Two small metallic shims, about the thickness of one side of an rf-id tag, may not be compressed between the shaft and knob. If so, pull the knob, place one of the shims over the shaft, and reinstall taking care to line up the D-shaped shaft to the knob. If shims are missing, one can use a small piece of kitchen foil wrapped over the end of the shaft. This really isn't a showstopper issue.
Speaker is small and of course not high-fidelity. But if you don't overdrive it, is does a great job in the shack under normal conditions for ssb/cw. Use a quality external speaker and it sounds great. I do hear some very low level "chuffing" when spinning the vfo in ssb/cw, but that is only with headphones on, and when there is no antenna attached, or the band is extremely quiet.
Overall, I think it is a great value and a very nice rig for it's class.