BradleyT - 4:54 pm on Feb 11, 2011 (gmt 0)
I run 4 Drupal sites and the reason I don't post much here is because I don't run into problems. Our Drupal 5 site I built is coming up on its 3rd year anniversary and has processed over $2M in transactions using the custom payment module I wrote. Our big multi-lingual Drupal 6 site is coming up on its 1st year anniversary.
Yes the learning curve is high for both developer and user but definitely worth it.