Agree with much of what has been said. It really depends on how badly you want to experience it and what your risk tolerance is for missing it.
We had hoped to ride it twice during our 3 day trip.
Day one I planned a later ride on it and it worked splendidly - we hopped into line around 7:30 with a posted 45 minute wait and it took about 25 minutes to get to the pre-show.
Day three we tried the same thing, but found it to be down around 7pm. We hung out in GE and it came back up at 8pm - we hopped into line and waited 20 minutes before we got the dreaded message that recruiting would cease for the day.
So we got one ride in for which I'm happy, but it was a bummer to miss a second one.
There is a fair possibility of it going down on a given evening. If it is super important to you to do it with a minimum wait, and you want to be sure to get on in a given day, you kind of have to buy the ILL.
If you have the risk tolerance, then doing it in the evening is a good strategy. Sometimes if the ride is running well and/or they had significant downtime earlier in the day, they will extend the operating hours by an extra hour...but you can't count on that.
I wouldn't touch it for rope drop. Too much uncertainty, competition, and time commitment (even if it is running and you are first on...It'll be 30-40 minutes after open by the time you get off, and you'll be in the back corner of the park). But that's just me - I like to min/max my hours and that first hour is golden for getting on multiple rides.
YMMV.