It will definitely be worth it as you hit max level for one. I depend on this for raiding and re-export my gear every time I get a decent possible upgrade.
I've had my own frustrations with BiB in past and they've always been worked out.
Last week my level 62 monk had an issue with BiB and it turned out to be something with my enchants. Fixed within a day or two after my post even though they have to do quite a lot to support end-game players.
I've had my doubts in the past about whether I'm really getting best DPS out of AMR. Mostly due to old perceptions on the web. However AMR has proven multiple times with dps comparisions vs competing sims that they know what they are doing.
They've even taken the time to heavily tweak some of their gearing strategy around legendaries that have a very specific proc and play style like Boomkin's Emerald Dreamcatcher. Interestingly they were already working together with the Simcraft developers on it. There was a lot of energy spent by AMR staff on this and the results have been very positive.
I pay for BiB just like you and nobody's asking me to post this. I am just trying to point out why I pay for this.
I pay because I feel confident that AMR takes a huge amount of the headache out of finding the best gear and they are constantly working to improve and support it.
I have multiple gear sets saved out in Outfitter addon based on different AMR setups. AoE, Single target, Single target with specific legendaries. It does take a little willingness to play with the settings and learn to follow a sequence of steps, updating your gearing strategy sim every 10 ilevels or so as well.
Anyway I just wanted to answer from a user perspective since I know we have a hard time hearing it from official forum posters. The people who reply here are actually working on the product not just trying to blow smoke and put you off. These guys are very talented at what they do. I'm impressed at least.