I've got three slides cut by Atei (two M&P/Acro, one Glock/RMR) and three by Fink's Custom Gunsmithing (Shield/Holosun; M&P/Holosun; Staccato/Acro), as well as one done by L&M Precision who is out of business.
I can wholeheartedly recommend Atei and Fink's. I have not seen any of Jagerwerks or Maple Leaf's work. I'd suggest reading here on P-F for feedback on the other companies.