Here are some problems that people seem to have overlooked.
1) It has been ages since the team started, yet the coin is STILL unavailable on any major exchanges.
2) All the stats that you see on the official website may just be mere numbers but not actual value of all the coins.
3) The communication is terrible, I compare it with a few other ICOs I participated in. Telegram channel is one way.
4) The Combicoins's value is 0$ on etherscan and the sender's address is: 0x0000000000000000000000000000000000000000
5) No official updates on major developments, just random numbers and nothing solid.
Until I am proven wrong, I would advise to stay away. I regret having risked and gone to buy Combicoins.
(Personal observations)
Good luck
Edit: Possible reason for it not being on any exchanges is because it allows the team to continue selling scamcoins since if it went on any major exchange the price of the coin would define its existence and would be self-evident.
It is communicated at the very beginning that COMBI will be on one (or more) exchnages from jan/feb 2018.
I have had some contact with the team...and I personally think it's all legit.
And the concept is not rocket science...it just simply genius and it's working for everyone as long as cryptocurrencies exist (and rise in value).
I agree that the communication and marketing could and should be better.
But I have it rather this way than a slick and smooth blabla communicating so-called PR shit.
PS: I am more worried about EtherDelta being hacked...does that effect in anyway TRIA/COMBI?