I had used the previous non-commercial version on every site I have ever created or managed with no problems at all.
A previous review suggests a conspiracy theory where the older plug-in simply stopped working when the commercial version was released... My own experience is that 100+ sites continue to function flawlessly.
IMHO: The original and still the best. Ok it now costs peanuts but thus ensuring continuing development and support.
With powerful yet intuative campaign management, you will be up and running within minutes. Integration with JomSocial is solid, and tracking is faultless.
I must also mention the fanatical support the Joom Donation team provide. I had a small issue with a 3rd Party Extension and they provided a fix on the spot. If only this level of support was half as good for other Extensions the average web developer would be far less stressed.
A true leader in its field.