What do you like best?
"Spam Score" analysis. It's a small feature but it' is kind of nice.
This uses 17 unique signals to determine how likely a site is to get penalized/banned by Google. Domain Authority, though not necessarily an authority on a website's quality, it's a nice indicator to keep in mind for competitor links, combined with Domain Authority and Page Authority. You can't take any one of these too seriously, but it's nice to have a basic metric to keep in mind.
On page optimization grader is cool. However, a lot of tools have basic functions on this and makes it not worth the while. I would say this is a step above other tools in this regard.
What do you dislike?
The Open Site Explorer link tool is actually not very accurate. I've used it for about 2 years. At this point, it's not working that well for us: there will be many links it doesn't pick up that Google's Search Console will, and that Ahrefs will. It seems like it's way behind on picking up links.
The "Link Opportunities" does not do a very good job of finding mentions. I have found some when the tool finds none. In my somewhat-limited experience with it.
Also, the Keyword Explorer, though cool, doesn't provide enough keywords to make it worth the cost. As a Moz Pro subscriber, Standard, it's $99 a month. 5 Keyword Reports. The next level up has 30 full keyword lists, which is good.
The Standard plan tracks 300 keywords, which is not even remotely enough for a semi-serious SEO professional to make it your main rank-tracking software. The highest showed plan on their pricing is 7,500 keyword rankings for $599. That's way more than you can get for more keywords on other rank tracking services, like SEranking. Yes, there are other tools you get when paying for MOZ. But all of these SEO software tools have multiple features.
Recommendations to others considering the product
This is fine if you're just starting off and need some tools in minimal quantities. But if you're a serious professional with dozens of clients and campaigns, I think you'll find you've outgrown this tool. $99/month for a basic package is not bad. But the link research tool is only semi-effective. The Keyword Explorer is cool but doesn't provide you with enough if you have dozens of campaigns, without costing a lot more than $99/month.
What business problems are you solving with the product? What benefits have you realized?
Overall I would suggest this for someone who's perhaps starting off and can't spring for pricier, more in-depth tools. I think this is a good basic starter tool, but once you get more serious, have tons of clients and campaigns, and can afford to pay for several different tools, I think you might find you've outgrown this.
This helps with minimal backlink research, Domain Authority and other MOZ website indicator calculations, keyword research, etc.
However it feels a bit like a dilettante tool in that I haven't seen it do any one thing excellently, rather it does a number of things to an okay degree. Subpar to other tools that focus on those areas. Like Ahrefs for link building, SEranking for rank tracking, etc.