I have a love/hate relationship with IEMs. I have had custom moulds in the past but your ears change as you age, so you need to update them every few years, which is expensive. I now use Shure SE535s and they work OK. The band I play in is all mixed from on stage, so no engineer. We don't mic up the drums or bass and my guitar is live (I have an FX8), but I take a line out of my Mesa MKV head to the mixer, which is a Allen & Heath QU-16, to put a bit in the FOH and for my IEMs.
On the plus side for IEM, I like the fact I can hear my vocal and everything else I want clearly and it cuts down on the stage volume to protect my hearing, but it is not the same as the 'live' sound. I must try the reverb 'trick' to see if that helps with the sound.
On the negative side, as I mix from on stage, I have to keep taking an ear out to keep a check on the overall balance. The rest of the guys are good at helping me with this and we are so used to playing this way, we are all good at self regulating our volumes.
However, I do like the smaller quieter gigs where I can just use a micro monitor (Behringer B205D) as that all sound more natural to me.