Aside from suspicious marketing, gBurner is a decently capable and easy program to use. The interface is nicely rendered and logically laid out, and I especially liked the way the tasks panel hides not-in-use functions.
GBurner creates data CDs and DVDs, audio and mixed mode CDs, VCD and SVCDs, rips audio CDs, and handles images in ISO, bin/cue, daa, md, and its own gbi format. It also has the standard tools for erasing and gathering information on discs and burners. All worked just fine in my testing. Conspicuously missing is support for Blu-ray discs of any type or DVD movies.
There's nothing wrong with gBurner other than it being yet another $30 mid-range burning program with the aforementioned proprietary image format. To be fair, the same may be said for , , and several others. My advice is to stick with free alternatives such as , , or and search a bit longer for the ISO version of that disk image you want.