I got one for my wife and she loves it.

Sounds like decent grounds for a divoce

what’s “large” and what’s “cheap”?

case of a model M

I’m absolutely confused as to why not other manufacturer has adopted a little lip at the top of the keyboard above either the number or F keys to rest a pen. It was made in the days when scientists had their pen in one hand, log book on the desk and keyboard in the other hand. A place to rest the pen was necessary. It’s 'still important today!

thoughts on kinesis advantage?

Yep, fans are always the same. Keep them clean for a healthy life, and if they’re noisy then it’s the bearing. Giving it a push to get it going is the tell-tale sign.