The best thing about this software is it's simplicity in use as well as providing excellent customer service! It has been easy to learn how to operate for me personally and I've never had any issues with their team or support department whatsoever since we started using this program. Their sales staff was very helpful as well when they first presented us upon our purchase of this product. They were able to answer all my questions without being pushy at all which made them some sort of favorite vendor right from the start. With that said there are no real downsides other than maybe price point but if you can afford what it costs then its definitely worth every penny because once again - great customer service!! We have used both email marketing platforms and found OASIS by far superior so far. Email campaigns sent out daily via bulk mailings and scheduling appointments/sales meetings through this system allows us more flexibility and ease of management compared to others currently offered (and also saves money.