Yeah it works and works fairly well. Success isn't 100% or anything, but frankly when I hand type captchas or send them to decapther.com its not 100% either.

Nothing is perfect, not even Xrumer.
Overall it does a good job, and you could just export the failed with most tools and run them again. In general with Black Hat tools you are after volume anyway, so a few failures is to be expected, but if you need success just keep rerunning them and then after 2-4 rounds, turn decaptcher.com on and captcha sniper off and let if finish up the few final left overs, if any.
Bottom line though is you will save on all the captcha costs that you don't send to decaptcher.com I know people spending $150+ a month on captchas. Captcha Sniper is only I think $99 1 time. So if you can save $125 out of $150 a month then its a no brainer. If you only spend $5 on decaptcher every 6 months and your happy where you are then don't buy it. But if thats the case they you probably aren't even reading this thread.
I have tested it with Scrapboard (For those that have it), it works decently well on the platforms that are supported. I have tested it with scrapebox slow poster and it works well. I have tested it with scrapebox learning mode, with learning mode multi threaded and it hums along nicely as well.
I have yet to test it with AMR, but I am confident it works well. I would have had that done, but I got side tracked by a new Wiki Smasher that hit the market with limited copies being sold, so had to jump.
As someone above said you have to choose the platform your working with, but I don't see that as a problem. You can select multi platforms. So if your working with a mixed forum list or mixed blog list, just check off all that are relevant. It is a good idea to not just check off the whole list as they could cause some loss of success.
Overall its a great tool, and much needed in the market place. Its still new too, so I am sure they will be improving it and growing it in both features and captchas supported.
Plus support is great. I have talked with Mike several times and he always comes back with quick replies to my questions.
Everyone of the people I work closely with that I have showed it too have been stoked and say - "Oh I want to use it with X program, test it for me and if it works Ill buy it" and so far it has worked with everything I have tested that it says it does.