I have since checked out John's link, and I find it difficult to really see if there is a consistent problem. People have problems for all manner of reasons, and what I read is not cause for major concern for me.
The issues with keyboard and trackpad drivers as noted didn't really say if they were had by people who were doing a completely clean install of Windows 8, or if they did an install of Windows 8 "over the top of" the Windows 7 that comes on the G73 (including the drivers for said keyboard, trackpad, and other stuff). I am planning to do the latter for this laptop because I think Microsoft has improved this process. It's worth a shot anyway.
I think I'm going to go for it, maybe this weekend. I have been able to clear some junk away and enlarge my C partition to 280 GB, with 195 GB Free. After the upgrade is done, I'll shrink the C partition back down to something like 150-200 GB and distribute the freespace to my other partitions. I now have Macrium Reflect on this laptop, due to the "Great Acronis Failure of 2013" which was actually in the making for at least 5 years for me. All that's left now is for me to buy a new external USB 3.0 hard drive and back up everything like it was the Dead Sea Scrolls. Windows 8 upgrade license bootstrapper was purchased and downloaded months ago, and the link is on my desktop, so I think I'm ready to go.
Either I'm really good, or just confident in myself. ...um, or really stupid.
What the hell, this is mostly a mobile music-making and gaming rig! There's no time like the present to find out how good I am (or how good I am not, as the case may be).
I'll post my results, clever or otherwise!