I've tried SL upgrade to Mv
I've tried ML upgrade to Mv
I've also tried clean install of Mv
No unusual anomalies out of these upgrade paths.
The only thing I gain from SL to Mv upgrade is that Intel-coded apps that still carries a PowerPC-based installers (in my case Starry Night Pro, and an obsolete Epson scanning software) get ported over to Mavericks without issue.