my two cents
I got into longer range shooting with standard mil-dot. in the middle of a long range class, my elevation turret broke, so the instructor was kind enough to let me use his Bushnell HDMR II 3.5-21X with H59. I have never looked back after using it. I was going from estimating b/t 1MIL dots to something that had holdover lines. I could use the bottom grid out to about 600M for wind calls and elevation - no dialing. (I was shooting 6.5G on a course that had 600 - 1000Y, from memory, 1K is a 13 MIL elevation dial/hold). Yes, you can do all of this on a standard mil-dot, but the extra granularity and bottom grid are REALLY useful. If you are using a round like 308 or 6.5C (everyone else was), you would never have to dial out to 1K. I think 308 elevation holds were in the sub-10 range and 6.5C were in the mid-8's.
The elevation lead lines (those right on top of the horizontal stadia line that make a "hat" across the reticle) can be used to do distance/hold estimation without formulas or range finder. We tested that out as well and it works well enough to make hits.
If I could do it over, the two scopes I have that are mil-dot would be H59's or Tremor3, or the Vortex EBR-2C.
That being said, there is absolutely nothing wrong with mil-dot...especially if you are just learning the ropes with it. That's my two cents from an average long range shooter that does not do competitions, etc, etc.