The actual reader is fairly basic and could use some ease-of-use features (like turning pages with the mouse wheel, pressing ESC to back out of the Convert feature window, etc.), but the embedded file converter that can flawlessly turn a CBR or PDF into the other format is absolutely wonderful!  95% of my useage of this app is for that feature alone.  It truly is outstanding.

Now, if the reader itself was color-managed (meaning that it recognizes different color profiles imbedded in the images), I'd use this program a lot more for reading my CBR files.  Unfortunately, it is not, so CBR files look a bit de-saturated on my PC compared to viewing the images in a proper color managed app.  Being that this is likely just a hobby project for the developer, I don't fault them for this, as it would probably take a TON of work to properly implement.