Yes i did , i can say few things about this site (if you have more questions feel free to ask)................

1. Sometimes they run some boost-miles campaign during a period of time , for instance first stay +2000 miles , second stay +4000 and third stay +6000 miles . I havent seen such operations for a while , they made quite a lot of them in 2015 , The last i remember was in may 2017
2. they are a part of points.com
3. Usually you can find cheaper rooms than buying directly from hotels
4. Since 2017 i noticed an increase of ''apartments/hotel'' , which are basic flats (or pieces of flats) , rented as room with all included . So not real service like in hotels , but its often cheap . You can often find them by booking or airbnb
5. They have a strong network in france (normal cause a lot of FB members are french) , but they are developping in many countries , especially capitals and touristic cities) , so it depends on the city you can have a wide choice or nothing
6. if you use them for business trips be sure that invoices will not be a pain in the a$$ because of accounting
7. you login with your FB credentials
8. sometimes the cheap places that earn lot of miles are sometimes far away from the city center
9. most fares are non-refundable
10. even if you have a status in Accor , Hilton or rlson , it will not be recognized , you cant enjoy the benefits or collect points
11. depends on the property/owner/agreement , some rooms/flat will earn lot of miles , many will earn same basic amount

So basically its good if you use it for lot of business trips , if you plan some weekends away it can be useful to check cause prices are usually cheap and dont fluctuate that much.

I collected quite a good amount of miles from this website , especially when i cant go to Adagio/Mercure/Novotel and collect points with ClubAccor (and then transfer it to FB) .

However because of the future ''improvements'' of FB , i dont know if pointshound will give more miles or if rates will stay the same

Oh by the way , if you book a trip from AF website and right after it you book a stay in Accorhotels you will have a bonus of FB miles