Its pointless to upgrade if Joe Belmatti is not making his anti-spamword MOD available to phpBB3. I dont want to spend the whole day deleting spam posts. I wonder how without that MOD phpbb3 users are managing ? Morever for thelogical and children's forums there cannot be any laxity for even a minute, and I dont have resources to get human moderators delete spam posts 24 hours a day.
I think people are downloading phpBB3 as it is hip to have open source software and you are perceived as doing a service to the world by fighting evil Bill Gates. I doubt anybody who is serious can use it without Joe Belmatti's MOD because only that MOD makes the forum USABLE , if you can understand what I mean.
You seem unaware that two simpler MODs, the RAC MOD, and the Security Question MOD, have been totally successful at keeping SPAMbots out of phpBB2 boards for a year and a half now.
As Jim stated, there haven't been any reports of the automated SPAMbots breaking the visual CAPTCHA in phpBB3 yet, so you are making a huge assumption thinking they are having problems just because they don't have the MOD you are currently using.