It's hard for me to recommend Customs. Telling someone to invest in CIEM's, when there is a chance they won't like them... is an expensive recommendation. I went to NAMM with our WL long ago, and we tried IEM's by reputable companies (1964 Ears, Westone... etc), and we really liked them. We recommended it to our church leaders, and they budgeted CIEM's for the core musicians. At the time, we got them made by Alclair for the WT. I got the Tours model... and that's when I realized that CIEM's are what works for me over universals.
Knowing what I know now, and back then... I would have no issues spending the $500... which is why upgrading to 64 Audio A12t's felt justified... and have no regrets buying the model I got. I still can't recommend CIEM's because it works great for me, but I can recommend brands like Alclairs or 64's. I prefer the 64's... not because they cost more, but the APEX module and the large port mesh design are game changers for me. The APEX module is like an open back headphone... it relieves pressure build up, and I have some ambience.. Also the mesh port design is so much easier to clean and maintain. I use my 64's more, but I still have my Alclair tours as backup, and they still sound great on stage. Not much of a difference between the 2 on stage. Where the 12t's shine is music/movie listening and gaming at home. You don't have to spend a lot to get into customs for stage use. 3 driver minimum (high, mids, lows/subs) is all a musician/singer needs on stage.