How much the honey pot practice is efficently against spam?

Question

With honeypot, i mean more or less this practice:

#Register form
<style>
    .hideme{
        display:none;
        visibility: hidden;
    }
</style>
<form action="register.php">
    Your email: <input type="text" name="u-email" />
    Choose a password: <input type="text" name="passwd" />
    <div class="hideme">
        Please, leave this field blank: <input type="text" name="email" />  #the comment is for text-browser users
    </div>
    <input type="submit" value="Register" autocomplete=off />
</form>

//register.php
<?php
if($_POST['email'] != ''){
    die("You spammer!");
}
//otherwise, do the form validation and go on.
?>

more info here.

Obviously the real fields are named with random hashes, and the honeypot field can have different names (email, user, website, homepage, etc..) that a spambot usually fillup.

I love this tecnique becose doesnt not cause the user to be annoied by capthca

Well, does anyone of you have some experience with this tecnique? How much is it efficent?

Answer 1

It works relatively well, however, if the bot creator caters to your page they will see that (or even have a routine setup to check) and will most likely modify their bot accordingly.

My preference is to use reCaptcha. But the above will stop some bots.