I want to defend here a bit RPX ICO sale which was done. Take it as my personal opinion :)
Pros
It was first ICO on NEO platform. This is risky business and many things might go wrong. Like NEO network might go offline, contract might be hacked, mails might be hacked – none of these happened. When ETH done that we had DDAO hack (and subsequent ETC hard fork, lots of problems afterwards). Eventually ETH fixed all problems and goes from 5$ to 300$ as they improved their platform. If you believe that NEO will do the same, its valuation should be higher than 30$ as of now right? When more ICOs will go to platform, value of NEO will go up.
They did start on promised time. They managed to fix all problems on the fly.
They was continually communicating on Slack, so I do know what is going on.
Cons
Slack wasn’t open for everyone. Don’t understand the reason.
Miscommunication and misunderstanding around second wave (aka block 25 problem), too-early contributions and single contribution on each period. This is bad and needs to be fixed on next ICOs. On ETH chain there is bounce back when contract is not ready, too early and single contribution rule is not common. It seems like weak point of current smart contract code of NEO which needs to be fixed.