100%, well you're lucky then.I currently have 100% boot rate with menuhax and luma ¯\_(ツ)_/¯
Well that's what you'll need to pay for if a9lh ever bricks your system, which is happening a lot lately.
That's what a9lh advocates irresponsibly have many people believing, but it's false. Browse through the forum for a while and you'll see lots of threads created by people who bricked their 3DS using a9lh, and a complete lack of menuhax brick threads.
And don't get me wrong, I think a9lh is great and I'll definitely be installing it should the latest updates ever fail to work with emunand, but until then I see no reason to take the risk using it.
2/5 luma crashes and Yellow screen on menuhax 1/5, plus very slow boot. I had to Force the shutdown, it's not healthy for the 3ds. So i preferded A9LH... Well it's fantastic!!
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It worth the risk IMHO