I have tested this faucet site for a few months. I analyzed all of their features. I have to conclude that I would recommend this site. Keep in mind, this post can be updated in future.
According to my tests (deposit/withdraw), the freebitco.in is legit. The freebitco.in is on the market for many years. During all my tests and experiments, I have not noticed anything suspicious. All of their features have reasonable parameters - they are not promising miracles. Also, they are very transparent and their games can be classified as a provably fair. I also wrote a Python script to replicate the random number generation process from server and user hash and I have to admit it is fair. They responded to my emails promptly.
The amount of BTC you can get from their faucet is derived from the value of the USD. The biggest price you can get is the BTC equivalent of $200. Every time you roll the faucet you have a chance 1:10000 to get the maximal price. There are also other bigger prices with various chances for success. The lowest price is approximately 0.002 USD. You can roll the faucet every 60 minutes.
How much can you get? In case you roll 10k times with an average luck (your rolls contain every possible number 1-1000 exactly once), then you win $270 worth in BTC. So in case you roll ten times per day, you get $270 in about 1k days (less than 3 years), or in other words $0.27 per day. Keep in mind that these numbers are average estimate for person with average luck in a long run.
Their multiply BTC feature is traditional HI-LO game with quite a sophisticated interface. The rolls are fair. You can validate each roll according to the server hash. However, no matter what settings you use, the game is set to return back to the users only only fraction of the bets. If you set the game to coin flip mode, you will get only 47.5% winning chance. You would need 50% to stay even. So there is no chance to win in a long run with an average luck. More information about the HI-LO game in general is my other post.
Every balance higher than 30k satoshi is automatically increased daily. Currently the earning rate is set to 4.08% yearly, so it is roughly 1 satoshi per day for every 10k satoshi you have. The interest rate is similar to other legit services, so I would trust it is not a scam trick.
There are actually two lotteries. You can buy or obtain tickets as a reward for using their features. However the lotteries are not worthy in a long run. The prize of a ticket is higher than an expected value. In other words, you pay more than you can actually win. The lottery is good only for fun.
The freebitco.in features quite a unique parimutuel betting option. The odds are set according to the pool size of the bet options. Example: if the most users bet on team A, you can get a much better odd on the team B. In common betting office you get odds according to an extremely precise prediction model, so you have a very little chance to win something in a long run. However, with the parimutuel betting the odds are given by actual bettors. Thus, if you understand any topic - sport, politics etc. better than other people do, you should definitely try betting via freebitco.in.
I randomly bet on random topics for more than 150+ times on freebitco.in with outcome close to 0. Thus, I assume that their fee is low and the winners are paid fairly.
The freebitco.in has probably the best referral program I have ever seen:
The freebitco.in also features interesting reward program. They pay you with reward points almost for every action you do (or your referrals do). You exchange the reward points for various prizes, or you can change them for BTC - one reward point is equal to one satoshi. Keep in mind that the exchange for BTC is possible only if you collect at least 100k of reward points. Also, if you play free faucet more than 12 times per day, it is worthy to buy the reward point booster. You can buy this booster for 1200 reward points, and it grants you 100 extra points for every free roll.
To gain as much as possible via freebitco.in I would recommend:
I would strongly recommend to use freebitco.in as a viable option in your free BTC site portfolio.