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I have had both for years. I have learned to hate the JB4. It isn't smooth and always seems like you need to tinker with it some more to get it just right. I have not ran MHD in a couple years but will be pulling the JB4 off and going MHD only again once I get my PS2 installed again.
I will say that, at least back when it was first launched, that I had worse timing with MHD installed, both as a BEF and as a standalone flash.
JB4 only
JB4 Cobb BEF
JB4 MHD BEF
MHD only custom tune
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2011 E92 335i | 11.7@125 SOLD
2017 Camaro SS | 12.7@114 SOLD
2019 Audi TT RS | 10.5@130 SOLD
2020 F97 X3M | 11.0@123
2023 G80 M3 xDrive
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