Everybody sells their mail list.  There is no telling how anyone got on this list - or the one's for Canadian pharmacy and other spam.  I wouldn't worry bout it or credit card numbers.
 
SFX is a good collection and the presets are worth $10 just for the ideas in it.
 
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I've owned SFX Machine forever... it's a fantastic sound design tool. Just playing with the presets will provide hours of inspiration.

FWIW, I received a similar offer from the developer to upgrade to the x64 version... and I will be doing so!
 
Great tool, great developer... at $10 it is an insanely good deal!!!

I went ahead and purchased the SFX machine 64bit upgrade and the Spectral machine (still only 32bit) and they seem to be well worth the money. Hoping for a 64bit version of Spectral machine someday.

I googled this because I had no idea what it did.  I found this youtube video that gives an idea of what SFX Machine Pro does. [quality of video not that good, but at least it shows some of the presets and what the SFX does]
http://www.youtube.com/watch?v=b4zsZsHMKvM
 

I got spectral while I was there, too.  $13.  Except in 32 bit it doesn't open - the little circle spins and spins.  Anyone have an idea?
 
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No problems here using Spectral and Sonars bit-bridge. The first time I opened it I had a problem because it opened the authorization window behind Sonar and I couldn't see it. Minimized Sonar, entered my license number, and clicked authorize. Everything worked fine after that.

I haven't clicked the order button yet. There was nowhere to enter the promo-code and it say's I'll have to pay the $99 for it.

It happens much later in the process when you put the promo-code in. IIRC, I placed my order, paid with Pay-pal, then it took me back to Share-it which is where I put the code in and the price was adjusted. Checked my Pay-pal account today and everything looks correct.

I never saw it and now I'm stuck with $99.99 which I can't afford. I sent them an e-mail so hopefully things work out.

I feel bad that it didn't work out right. Hope they will get it sorted for you.