loranne's ,which the sell at into the oven, has a cheesecake flavor too and I have added it to butter cream, it's good but you wouldn't mistake it for cheesecake. Of course you mistake the other I mentioned earlier!
I just prefer it, as far as lasting in a cake, I have used it As filling and had it in fridge till the day before serving then set our 24 hours prior. But as for setting it out, I guess I'd set it out and then serve no later than 2 days away, covered being in room temp is what I am referring to.