Blogging Auto comment software

I have recently looked at some information to see if it can be done to post automatically to blogs, although this has to be done with care to not come across as spammer I wonder if this is worthwhile to assist in getting backlinks to your sites.

Advantages for this is as follows;
Quick and automatically finds blogs to post on using your keywords.
Can load a list of blogs to comment to and this can be made easier if you use google alert to target what you want to comment on.
It fills out all the fields and makes things faster.

Disadvantages
Can come across as spamming and you have a standard comment across all blogs, if this gets picked up by anti-spam systems your links get ignored
Google will find you if you do this with the same comments and across too many sites which means you will get blackholed.

This is something that needs to be done with a certain amount of care to protect your site and not lose its rankings if you have built it up with genuine systems to ensure traffic and ranking

Comments please…