I ordered a new head sail from Mack back in 2015. Despite being 2700 miles away on the opposite coast. They were very good on the phone assisting me doing my measurements. And giving recommendations for a sail that would meet the demands of high wind central San Francisco Bay. Also to achieve a balance between performance = A sail whose foot would be somewhat low to the deck. But high enough for me to readily see underneath. Central San Francisco is a busy place on the weekends. A clear view forward from the helm is a must!
Their price wasn't on the bottom end of sail maker alternatives I was considering. But I perceived quality and service from Mack Sails. And their price was competitive.
The sail arrived exactly as ordered. Has performed wonderfully. This past weekend was the annual Blue Angels airshow over San Francisco Bay. Sailing with only the headsail with passengers affords better viewing (simply roll it up around the furler). Ease of sail management with many non-sailing friends on board is important. So no main sail. After the show, numerous boats head back to Sausalito on the same course. With only the head sail out, my 38 year old boat was catching up to or pulling away from most of them. Evidence that the Mack Sail jib is very OK.
The only downside of my experience has nothing to do with Mack Sails' quality or customer service. Which as above was great. In high winds, the upper leach of my new sail flutters a bit more than I think should be. Even with fore/aft adjustment to the jib-sheet car position; and fussing with the leach cord. If the sail maker was local, I would have asked for them to visit for a look-see. But my flutter wasn't/isn't serious enough to justify removing the sail from the furler, and then shipping it back all the way from California to Florida for evaluation. Probably only to find out that it's exactly as it should be.
Summary: All-in-all, yes I would do a repeat order with Mack Sails.