BORIS PARSLEY  P.U. Install fails, no help at the web site. Five links to separate bookmark services but not a single support forum.   
(Version 1.3.7)

ELLEE H.  How does Flagit! compare to MailTags? I've been happy with MailTags but SnowLeopard-compatible version will be paid upgrade so now is the time for me to look at options.  
(Version 1.3.7)

UNIXO  Nice idea, it'll be useful when smart mailbox support is realized.

Two stars because it also misses the uninstaller.  
(Version 1.3.7)

ED1921  Flagit! ver. 1.3.7 is Snow Leopard compatible!  
(Version 1.3.7)

JSH  Works great, but it overwrites my flag customizations everytime I load a new version. Frustrating.  
(Version 1.3.5.3b)

FLASH1296  Excellent add-on.

A VERY useful productivity aid.

Priced to be affordable to all.  
(Version 1.3.5.3b)

MDAY108  I process a LOT of email every day seven days a week.

In light of this, I find flagit to be invaluable.

I especially like the fact that I can choose to have the subject heading

made into the same color as my flag

which enables me to scan my flagged emails even faster.

On top of this, this is another great app from TastApps and besides quality...

you simply can't beat the customer service Tim and Tom give.

Give it a try and...

I don't know what the big hooplah is about if you try it

and discover that flagit's not for you.

It's very easy to uninstall but...

I doubt you'll want to.

Use it and put it to the test for a couple of days,

and I am sure you'll be as grateful for it as I am.  
(Version 1.3.2b)

FOULGER  Finally works as intended - what a relief!  
(Version 1.3.2b)

GCOGHILL  The dev needs to have more info on his webpage and some screenshots. How does this differ from IMAP flags?  
(Version 1.2b)

FOULGER  Flagit is a great little App which I was happy to buy after the trial period expired. The author is very quick to communicate. HOWEVER - I have a problem whereby "As completed" and "Clear Flags" stay greyed out. Whether this is a result of my using Spamsieve (I can't see how, though) or some other factor, I don't know. What I do know is that this wonderful little app, which should be part of Apple Mail IMHO, has a flaw, which the author, by his own admission will be fixed but he can't say when. For me it has spoiled the basic idea behind Flagit. I hope the author can sort it out sooner rather than later.  
(Version 1.2b)