Hi,
We use onyaktech Nuke Alert for about 6 months on a site for a customer. Works great and almost everything is adjustable.
In example : i wrote a few SQL scripts for integrating with the Ventrian News Articles module when you make a new token in the newsletter (Onyaktech Nuke Alert Module). The customer has 4 categories in Ventrian News Articles. The module has 4 different newsletters wich users can subscribe. The module can automatically create 4 newsletters with the last 4 posts of each categorie. This will be sends once a month.
So my experience : Looks good, works great, have to make some adjustments.
Great flexibility
Great support
Bye