I use Spike at work and there are some things I like and some I don't, but overall it makes my life easier and helps me avoid confusion. It does not group all messages from each email address together, but rather separates the automated messages. That's great for me because I get a lot of emails from email addresses that send both automated and "manual" emails. That way I can delete all of the automated messages at once, while keeping the actual communication between us intact. I DON'T like the fact it inserts a non-removable self-advertising link above the signature and it does not even let you know it does that. Spike is a free product so I understand why the have to do that BUT they should inform users in advance because they might NOT be OK with it :) Also, no way to print an entire email conversation/thread... Would love to see that feature soon.