This is a good investment and will likely be one of the top purchases I make this year. Was going to post a review earlier but did not have a chance to use it. Still early days but here are some pros.

+ Fastpages Team - Koen and Jalal are very supportive AND receptive to input. A good example of this was revising their Tier 5 plan to allow for unlimited workspaces because a few of us felt the 100 cap should be applied to tier 4 as it limited the value - Koen and team providing a fully unlimited T5 is the main reason I feel obligated to reciprocate by writing an honest review.
+ Generous Terms - Very good terms of use deliver value across the tiers, of course if you can stack for Tier 4 or 5 this is what I recommend if you want the headroom in the future.
+ Platform UI/UX is good, not seen any bugs and product appears mature already compared to others who may have an ambitious roadmap but a very beta offering.
+ Livechat support - have not used it but positive to see this and not email only support.
+ High Quality landing pages and sections look modern and clean.
+ Multi-page websites - This is important for me, I usually do not build single page landing pages but multi-page landing pages, concept websites and full functioning websites that generate organic traffic.
+ SEO Options - Fastpages has seo options and would like to see this expanded in future as its important for ranking pages and websites organically.
+ Fast loading pages - true to their name, they load fast and its easy to get your sites up.

No Negatives because this is still a maturing platform but please do these:

- PayPal integration - This is a MUST because for me and many people around the world, Stripe is not available so we really need more payment gateways starting with PayPal.
- Expand the sections - I think the quality of the themes and sections is high but need to see many more options in the section. I may have missed them but please include tabs, accordions, sliders, hovers (with text over images) and other dynamic sections in the future as this will enhance the look of the website. Helps us provide more information without making website appear too busy.
- Small suggestion but can you put the undo-redo buttons on the top permanently, i see they are on a ribbon that appears at the moment when activating an element. Also as someone mentioned below, please allow us to upload custom fonts using ttf or something.

Overall I am confident that Fastpages is going to be a leader in the landing page and express multipage website space, I look forward to seeing more as the platform continues to mature. Highly recommend that you buy into this especially at T4-5 for unlimited if you can justify it.