Borgata "dailys" with addon, no rebuy - thoughts?

[SmackeytheFrog]

I'm heading to AC for 4-5 days of tournaments, mostly Trump Classic, next week. I plan to get in town early Monday and do the Borgata daily NLHE. It's a $50+10 with 1 optional addon. I called in to ask about this, and it seems that there is one optional addon after a couple rounds, but no rebuys. I've never played this structure before. I've seen instant addons (a stupid structure, gee for $10 more should I double my chips? - Alladin in Vegas) - rebuys with one add on of course, but this is unfamiliar to me.

I would assume that I should plan to buyin for the addon if it is right away. That's a given. But if it's after a couple levels, do I automatically addon? Should I forego it if say, I have 4x the starting stack at addon time?

Is there a conventional wisdom for what I think is an unconventional tournament structure?