Many sails are made abroad so that's not necessarily a negative.
Here's a few things to consider
Construction
Make sure you are comparing apples to apples, fabric, thread count, reefs, double vrs triple stitch, reenforcement of clews, well mde batten pockets. There are many subtle cost cutting measures of than cheap labor abroad that mail order sailmakers use to drop the price. That doesn't mean they are bad sails. Many times it doesn't show up in the first 5 years, when all new sails look good.
Customer Service
Local lofts many times will come measure, then when your sails are finished come a fit them on your boat. Thy will adjust them. Mail order wont. If something is wrong or miss cut, they can handle that many times in thir own shops. Try that with a mail order sail. You will lose many weeks sending it back nd forth if thy even are to adjust it in the first place. Warranty from defect is more likely to be corrected from some local or semi local.
Price.
Your sail should last at least 10 years. Of corse his depends on many things. So lets use tht as a base. A 35 foot sailboat main costing $3000 from a local is $300 a year. The mail order sail $2200 or $220 per year. Is the quality peace of mind repairs, warranty, and maybe quality are worth $80. Look at used sails and see how many name brand serviceable sails over 10 years are there. That's a clue to longevity.
iMHO Rolly Tasker has a better reputation than most mil order sail makers. It still isn't the same as local or semi local.
We have two Quantum sails. They were about 25% more expensive than mail order for similar ones. They are very well constructed, made in South Africa, fitted by the local loft who measured, fitted thm when thy arrived, and came back a year later to adjust and insure thy were wearing well. The batten pockets are the best deign and construction I have seen.
You get what you ay for I beleive in sails. To me since its my means of propulsion, and one of the bigger ticket items on a boat, I would not scrimp here looking to save a few dollars on the front end. If you can buy in Sept-Feb when you can get deeper discounts from mt major sailmakers. Don't be afraid to barter with them for extras like daft stripes, numbers etc.