Bob...you know you and I are on the same page on this issue.

Rangeball
I can't give you any info on mech heads because I haven't used them because of the reasons in my earlier post.
As far as the Magnus 2 blades, I can give some imput. I've shot them exclusively for the last 6 years, and along with muzzy's a couple more...before I made the total switch.
I have killed deer out to 40yds with them, although I rarely shoot past 25, and usually under 20. I have never run into a problem with the wind(not saying it couldn't happen) but as most of my shot's have been under 20, it's never been a problem for me, even if it is windy.
Of the last 12 deer I've shot at with them, I've killed 11...and hit a limb with the other. I've had absolutley incredible perfomance. All but one was a pass through, and that one was at 40 yds, quartering away hard...entered the middle of the hind qtr, and exited the middle of the opposite shoulder blade(but the arrow didn't come all the way out...about 50%). That is IMO great penetration...and my setup only shoots around 240fps.

So like Jeff said earlier, each will have his own experiences...but for me, I haven't (yet) seen a con to shooting these heads. And one of the biggest pro's is that they are $20/6 and you just resharpen them , clean them off, and back in the quiver they go.
I just feel that if there is a chance of something that can go wrong, I have a better chance of it NOT happening, using these heads.

And btw...most of the deer I've shot with them have run less than 50yds....but that is a shot placement issue..which is really the key to success anyhow(not the type of head).