FWIW:
1. Never got my E6510 to get past the panic issue using the Yosemite guide. Tried every flag permutation I could come up with.
2. Flawless install and everything but sleep works using the Mavericks guide (same guy)
3. Currently trying Yosemite install. I used unifail 5 and selected Laptop option. It boots with nv_disable=1 flag and I need an external USB mouse to click options. Currently installing.
If yosemite proves too hard, I'm just going to stick with Mavericks.