I have the custom bcd on my Leupold Vari-X III 4.5-14x40 on a Winchester model 70, pre-64 7mm STW. I absolutely love it. Coupled with a good range finder and it almost feels like cheating.
I sent my scope & my ballistic data to Leupold probably about 10 years ago. Turn around was quick, great customer service & less than $100. Haven't had any issues holding zero, striping screws, nothing bad and I put my equipment through the wringer.
Only thing I don't like is that the bcd elevation turret is taller (about 1") than the stock turret. But I think the new ones are designed differently & don't stick up so much...
Adversity does not build character, it reveals it - Audaces Fortuna Juvat