I've been going with same for years too. For me an analogue delivered the same hit from start to finish, so why not in a mod too. I've got lots of mod bodies, but not so many atties. The plexi and o-rings needs replacing occasionally but the design is mostly all the same. One thing I've noticed is the 4050 fails sooner than the 8100, but I tend to push these puppies to the limit. A consistent vape is the key to everything.....