Funnelytics has helped me close clients by making marketing and GTM strategies easy for me to visualize and my clients to understand. The mapping tool is easy to use and looks great.

They just released a forecasting tool as well, which takes mapping to the next level. Now, I can map the customer's journey and apply forecasting numbers based on my data to show what ROI might be with a certain strategy.

The analytics tool makes it easy to prioritize optimization across your marketing campaign / customer journey. You can see at a glance where customers are dropping off, or slowing down.

You can also map all the various journeys prospects take on your site. Easier to use than GA. Review collected by and hosted on G2.com.

I can't say for myself, but I've heard others say they find implementing tracking hard... I think they've fixed this with a universal tracking code deployed by Google Tag Manager now... Review collected by and hosted on G2.com.