I don't use iBooks on the iPad, never liked how it worked nor the lock-in from buying through it. However, I've not had any of the other mentioned issues with Mavericks, ML, Lion or SL. I've used several brands of router/modems over the years and never had an issue connecting wired or wireless to them.
The only issue I can recall experiencing to date is how Apple messed up multiple monitors in Lion/ML but that's finally been resolved in Mavericks. Plus the file sharing between windows and mac is a lot more stable now with Apple's move to SMB2 rather than their proprietary AFP.
I wouldn't call Mavericks a great improvement, but it does fix a few annoyances that were introduced in ML and Lion.
I would have thought though that if people like iBooks on the iPad, having it available on the Mac would be a bonus? I'd rather use the kindle app or goodreader though with calibre for managing books on the Mac.
Bug wise, anyone who updates to a new release within the first month or so is likely in for a bumpy ride. Usually I'd hold off at least that long, but I felt like being a guinea pig for a change
