...An interesting question is how many people came in contact with U++, what was the retention rate and with what impression did they leave. Emphasis on the last point.
I downloaded and tried TheIDE few times, year or two between the attempts. Every time I felt like an idiot who recognizes nothing, who is unable to use intuition to orient throughout the space. The documentation wasn't very helpful and the IDE itself gave no hint what one is doing. Eventually I admitted my inferiority and gave up.