[TYPO3-english] spammers beating captcha

[Simon Child]

I'm using extensions captcha 1.1.1 with comments 1.5.4 and tt_news 3.1.0

Today I have had several spam comments posted, so it seems they are beating 
the captcha (or entering it manually? but if so unusually persistent to try 
it a dozen times or more).

The comments are not appearing on the site because I have it set to send all 
comments to me for moderation, so they aren't getting the encouragement of 
seeing their postings appearing, yet they continue trying in what appears 
may be an automated way.

Is captcha 1.1.1 known to be commonly beatable by spammers and I should give 
up on it?

(I can't use sr_freecap because that needs PHP 5.3 and my server uses 5.2)


Thanks

Simon Child