Many like the Acratech, Arca-Swiss, Markins and RRS heads but unfortunately they're mostly expensive. Induro is a Benro brand and while I use a Benro tripod and like it I'm not so hot on their ballheads.
I would look at the Photo Clam range, I've used one and they are well made and good value for money. There are members here who use and like Photo Clam ballheads who will hopefully chime in - like the Markins they are copies of the Arca-Swiss Z1. I use a Z1 and can tell you that it absolutely and positively doesn't shift as you lock it down!
The Sunwayfoto ball heads are surprisingly well made and designed. They are pricy compared to other Chinese models but a bargain compared to USA and European heads. My only complaint is the arca clamp knobs are a bit on the small side compared to my Kirk and RRS clamps.
I have 2 Acratech heads as well as an Arca-Swiss Z1.... Frankly I think the Acratech heads are a bargain in the marketplace! US made, and rock solid... and do not shift at all. I can put my 500 + 1D4 on it and lock it down virtually anywhere in the range of the ball... and it doesn't move. Oh, and if you ever have a problem (i had one a long time ago) they are a US phone call away... not so sure about the Chinese brands.
I'll also recommend the Kirk heads too... Jeff Kirk is a class act and produces a fine product.
I've been using an Acratech for nearly ten years, in all kinds of conditions from Hawaii to Iceland. I have used a Nikon 500mm f4 lens on it as well as my Chamonix 4x5. The head is very, very solid. It does not shift as it's being tightened, and it's impossible to jam in the snow and ice. Mine has even been hit by a freight train.
I've been using my Acratech for only three months and bought it for its reputation as an all-conditions head. The Markins Q3T on my travel tripod locked up on a trip in northern New England and then again later on in Boston during severe cold in the winter.
So I replaced the Q3T with an Acratech and so far so good, build quality is excellent and I've gotten the hang of using it. Looking forward to the summer when it goes to Europe and will be on beaches quite a bit. I hear you can just run it under a faucet to get the sand off it.
