Also the waiting time for upgrades - I am not a patient audiophile.
I am surprised you made that statement. Many manufacturers come out with non-stop upgrades / model changes which, frankly speaking, annoys the hell out of me. There are only a few reasons this happens:
1. A manufacturer does not put their best foot forward or has rushed to market and needs to make changes.
2. A manufacturer is looking to dip into the well over and over again with "face lifts" and keep milking the customer for every cent they can get.
3. There is truly a technology/material improvement that makes it impossible not to do. (Very rare)
4. Part are no longer available and necessitates the change.
5. Keeps the brand in discussions and magazines as they always have something new.
Many justify this with the "getting a new car every few years" analogy. I do not believe in that justification. A car wears out much quicker and in time does need to be replaced. Not so much with audio equipment.
darTZeel takes many years to develop a new product or upgrade. The process requires a recognized need, a formula for improvement, prototyping, proper testing, listening and only then production if the increase in performance is substantial.
Many darTZeel owners get off the "audiophile nervosa merry-go-round". I experience so many customers sharing how different there musical experiences are from the first few notes with darTZeel instruments. Most darTZeel owners are "lifetime" customers and find themselves focusing on the musc more than the equipment. darTZeel is an "end game" product that is worth the wait.