Tony, I wouldn't bother getting the RocketBladz at this time. You're only 2 levels away from qualifying for the R11 irons. And you'll like those a lot. I had the Burner 2.0s before the R11s and the difference is great. So what if the R11s are the same meter speed as the Burners, they are worth it.
L90 is 486,988 XPs and you're probably in the middle of L88 now around 410,000 or so? At the most just 2 months away from the R11s. But if you buy some XP boosts, using them wisely, and play some AS or 18 hole tournaments you'll get there in a month or so.