I personally feel that the Jewel triggers, while very nice, are somewhat overrated. They are mostly well made but there were some problems with sear dimensions for a while. Apparently a sub-contractor problem. Many users seem to like their Jewel triggers set up with considerable creep. It is very smooth creep however.
The shilen trigger (the match trigger, that is) is a 3 lever design. The same is true of the remington and Hart 2 oz triggers. Neither the Shilen or the remington has a safety while Jewel does make one with a safety. I made a few Remington 3 lever conversions with safeties but was never really happy with the way they worked so I quit doing them. If I were to do this today, I would build a bolt sleeve safety to use with the 2 oz. triggers. I'll not be doing this any time soon however!
I still think the Canjar in it's heyday was as good a trigger as has been made but have not seen a current example if such is even available. Regards, Bill.