Hmmm...
That is a good question. As far as being a reputable business they fit the bill, but when it comes to providing technical or geographic info concerning the way a detector will react to other types of soil they so far have not had even so much as a clue.
It almost seems that KellyCo lives and breathes Florida low-iron salt soils, end of statement.
In the past I have ordered Minelabs from them, Fishers, Bounty Hunters, ets, and even after all these years most of the the sales people there still don't realize the difference between soil in my neighborhood (west of the Rocky Mountains) and the soil types found in greater Florida and it's bordering States. A metal detector operator in Washington state will have a different time with the same detector operated in Michigan or Tennessee, etc. In nearly all cases for example, a Minelab Sov or Expl does a really nice job hunting beaches in Fla but in Oregon or Wa, they pretty much suck, when compared to most Fishers and White's..
My advice is to try each and every detector WHERE you intend to use it, BEFORE buying it. After trying, then buy from KellyCo! And NEVER, NEVER, NEVER buy before you try. I have seen people stab their detectors with bayonettes, wrap them around a tree, and throw them on the ground, and all because they were angry when the #$*^$ things didn't work as well as the clearing house or high-volume dealer said they would.
I'm just giving you the truth - from my experience.
LL