daysailingDFW wrote:I've bought from Intensity Sails for another boat, and they were worth every penny IMO.
Now that can be interpreted more than one way

I believe that there are differences between the different sails on offer and that not all of them are due to using cut-rate labor on one extreme or paying heavily for "racing brand mystique" on the other end.
I'm not a sailmaker, but there are obvious differences in the construction of some of the sails. Those that are class legal (can be used for sanctioned racing events, even if not exclusively intended as racing sails) must adhere to the sanctioned number and placement of battens (and other dimensions). Those that are not, can go for different approaches.
Sometimes the pictures allow you to note that sails have a different number of seams, and are therefore built from a different number or arrangement of panels. The reason this is interesting is that the edges of any panel aren't straight. They are curved, and this "broadseaming" is what gives the sail its eventual shape. Such obvious differences in construction will lead to different performance.
Now, it's easy to get the DS to move with any kind of sail, new or old or with any kind of construction. If you don't race, you likely won't have the comparison of a another (identical) boat going your way, so you will have no real way to observe how efficient your sails are. For older sails, you may notice that they are harder to fly without luffing in certain conditions. The leech of the jib is often the first one to "flutter" uncontrollably as sails get older. Another effect is that older sails can't be trimmed as flat, so you may need to reef earlier or experience more heeling. Again, without direct comparison, this may not be very obvious, because the wind changes all the time anyway.
Any new sail will set better than an older set of sails that you replace. And there's the rub. Unless you compare like boats with different (new) sails or otherwise have a good comparison, it's hard to judge reliably whether any particular set of new sails is "worth the money".
Some sails may not even be their best until you've used them a few times (but not too many). They may be too stiff out of the shipping carton or you may need to get used to trimming the best out of a new sail. My first replacement set of sails replaced what may have been the original sails on the boat. The effect was dramatic. The next time, less so. In fact even though there had been clear indications that the jib, at least, had blown out by that time, the new set initially didn't want to feel right. Same sailmaker, and I don't think it as slipping quality. May well be, that I had to "unlearn" some habits that crept in as the old sails went downhill.
It's notoriously hard to get a really objective view on where the best value is for money when it comes to sails. You'd have to not only compare them all against each other when new, but also get a good idea how long each retains their shape and, for cruising, for example, that question has a different answer than for racing: for racing you care how long a sail remains close to its optimal shape, for cruising you might instead care how long the shape remains "acceptable". In other words, you might care more for the tail end of the lifetime curve.
If one set is twice as expensive as another set, and you change them equally often, the former is clearly more expensive. But what if the cheaper one has to be replaced twice as often? (I don't think that's an entirely likely scenario, but still, I like to think of how an expense gets averaged over multiple seasons).
As a result this is a highly personal choice based on a total absence of hard facts (other than purchase price, that's the one data point with the best precision

). I've purchased more than one set of sails from Hank Jotz in California. By price, they are "higher middle class"; cheaper than the top-line racing brands, and more expensive than several of the other options. I've generally been happy with them and I actively "race" but not against like boats and in a casual setting (where most of the other boats don't upgrade their sails all that often, so we all tend to use them until they become hopeless).