You don't see too many Magnolis, but those who do own one have given excellent reviews. I believe he provides you with a detailed sizing chart to fill out, and takes care to ensure that everything turns out right. I've never seen a negative review of one of Magnoli's jackets.
I am aware of 3 COW members who own or have owned a Magnoli: Holt, Chewbacca Jones and, most recently, djd. There are probably others, but those are the ones I remember seeing, and they all looked superb.
I think Big Tony's offerings may have lured away some of the business that would otherwise have gone to Magnoli. I know that was the case with me. There are some people who simply refuse to spend $675 on ANY jacket, and if you fall into that category, Magnoli may be your best option. Of course, there is also Todd's Custom, which sells for around $500 and has also received excellent reviews.
Jack