Been awhile since I posted here. Hope everyone is doing well. As for me, I have had nothing but problems with button failure on pens and mods. Now that my Kroma-A mod had a button failure, that makes two mods and a pen dying due to button failure in less than a year with another mod on the way to failure (Sigelei MT) due to only one light working that I am currently using as an emergency backup. I can't just buy another Kroma-A mod only without buying a kit with either another Zenith tank or an unwanted Crios tank on a USA website. The Aegis Legend appears to be the mod of choice for people seeking overall durability but I am concerned solely with the firing button's durability for heavy mtl use. Any recommendations based solely on firing button durability? I'd prefer either internal battery or dual 18650 battery since I don't wish to either divorce one of my 30Q pairs or buy two new ones but will if you believe the recomendation is worth it or other battery sizes for that matter.