The amount or size that I can grow with their platform is amazing! What i like most about it are all its features which gives me freedom in finding ways for my business growth without being concerned as they give us everything we need at very affordable prices. There isn't anything bad what so ever when talking this software since you're able solve any challenge faced by your clients through email marketing campaigns; also it integrates well within other platforms such as Google Analytics & Gmail itself making life easier than before whenever an issue arises. The customer support is excellent! I have dealt with their team on several occasions and they are extremely knowledgeable and helpful. They also have a very easy to use interface which makes it super simple to set up alerts and test them out. The price point is great and the service works well in conjunction with other services like MailChimp or MailGun so you don't need to get your own server. We've been able to solve problems related to spam and deliverability that we were unable to resolve ourselves.