The ability of being able to have different types (eCommerce, non eCommerical) campaigns which can be customized with their own branding is what I like best about this software! Also they are always working towards adding new features that make it easier than ever before!! Nothing really at all as far as dislike goes but if you're looking forward to having an easy way to promote your business online then definitely go ahead & use invite box :) You'll get tons more views/clicks from people who actually visit or click through links within these emails compared to traditional methods such as social media ads etc., plus you won't even need any coding knowledge because everything's done via drag'n'drop so there isn't much work involved either ;).