I use a HHA and its a good, solid sight. Well worth the money. I switched to the single pin because I was having trouble with torque with the horizontal pins, all mental. Once I switched to the vertical pin my groups got a lot tighter. The only downside is having to move the yardage bar for longer shots. My DXT will shoot 1 pin in the kill zone out to 30 yards but anything beyond that I have to move the sight.
I had kind of a circus situation this year with my HHA and one of my doe harvests. I had a group of 5 does coming down a trail I ranged at 40 yards so I moved my pin to the 40 yard mark. I came to full draw, and then they turned and started walking towards me. I had to let down, move the pin down to my 15-30 yard marker, came to full draw, about face, they turned and headed the other way again. Let down, put it on my 40 yard, lead doe steps into a shooting lane at 43 yards and I took her out.
So, it just depends, they can be a pain, but most stands are set for a 15-30 yard shot anyways which makes the pendulum nice IMO.