I don't really regret any of my purchases.  They served the purpose at the time they were bought. As with all things in life, especially hobby things, one tends to outgrow stuff and move on.  No regrets.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi