Take a dozen rackets to a dozen shops to be strung. I doubt you'll see ONE Stringway machine.
The last thing I want to do is to start a stringing machine war on this thread. But I feel that this comment is incredibly one dimensional so I want to add in my 2 cents.
It'd be more correct to say that you won't find tennis shops using drop weight machines for the most part, and Stringway is primarily a drop weight machine so it's in that category. The prejudice about drop weight machines is that they're generally very slow to operate (because they must be set to near perfect horizontal for correct tension). People who don't know enough about Stringway machines carry the same prejudice and dismiss it in the same drop weight category as all other drop weight machines.
Naturally tennis shops don't want slow machines because time is money. That's why you don't see them use drop weight machines. It's not just a Stringway thing. It's a drop weight thing.
High end shops will buy electronic constant pull machines because they're supposed to be the best and very fast. Budget tennis shops that can't afford expensive electronic machines will prefer to use lockout crank machines because they're also pretty fast, and not as expensive.
Another thing going against Stringway machines is that they're not cheap compared to the other generic drop weight machines. So it turns people off thinking why they should be paying a premium for a drop weight machine no less at that price?
The question one should ask is why is there a small following of home users who still don't mind paying a premium price for a Stringway if it's just mere drop weight machine? What's so special about it that command a higher cost than other drop weight machines?
The answer is constant pull. With no hassle of keeping the drop weight horizontal. And at a lower price than an electronic machine in general.
People who don't care about constant pull prefer getting a fast crank lockout, or an electric tensioner.
People who care about constant pull are divided into 3 groups:
1. Those who don't have a budget limit tend to buy a high end electronic machines in the $2K-$5K price range so they can get all the bells and whistles, constant pull included. High end tennis shops that string fall into this group, too.
2. Those who have a small budget settle for a drop weight machine so they can get constant pull, beside the low price machine, and have to put up with the hassle of balancing the drop weight to horizontal for proper tensioning.
3. Those who can afford more than a small budget, but don't want to spend too much on an electronic machine north of $2K and up, found the Stringway to be a good middle ground compromise. It's in the $1K range yet still provides constant pull like the more expensive electronic machines. It's a drop weight but doesn't have the inconvenience of a drop weight because of the patented tensioning jaw that provides the same correct tension at almost any angle. So the drop weight doesn't have to be horizontal. This is where you will find followers of Stringway machines -> home users (not tennis shop) who want constant pull but don't want to put up with the hassle of the traditional dropweight, and also don't want to shell out $2K or more for an electronic machine.
If you don't care about constant pull, don't consider the Stringway. If you do, they provide a great compromise between price and ease of use that a number of home users are sold on.
The beauty of all this is that there's a plethora of stringing machines that can fulfill just about every need and desire and budget with various trade offs. The key to selecting a stringing machine is knowing your budget, knowing your need, knowing your situation, knowing what you want in terms of features and convenience, knowing the technologies offered and what they mean to you, and most importantly, knowing the trade-offs between all of that so you can make informed decisions on your selection.
Just because somebody says machine X or Y are the most popular machines doesn't mean that you should want to buy them because they're the most popular. You should buy them because you've made an informed decision about them already.
The question is if the OP is informed enough?