Did you mean NA switch and Muon filter?
Yes- individually the Switch and muon filter got great reviews, hoping that together they’ll be complimentary. The SR switch seems like a good buy.
If yes, did you try other switches before NA and how did they perform?
No. I followed others on WBF who compared. Switches were fairly new so took awhile for comparisons and thus determined relative value. Iirc The switch that started the audiophile switches was the Telegärtner’s gold Switch. Ediscreation Seems well constructed for the money. Ansuz used more Tesla coils as one moves up their switch product line- pricey and NA seemed better technology rather than add more of the same tech. Lower priced English Electric 8switch, Silent Angel, etc seemingly had questionable marginal improvements if any.
As always, one should have a transparent enough system to make this sonic uptick worthwhile. Sometimes spending elsewhere might yield better performance/value.