Quatro belongs to Playshare. A somewhat botched launch, and mention of "poison chalice" terms and conditions. The other Playshare brands were having a spell of substandard service levels, and this did not give me any confidence at the time that they could effectively handle a third casino, and as it turned out, they struggled.
Time has passed, and I have not seen a raft of Quatro complaint threads, and Grand Mondial have made some improvements to the quality of service.
I have one doubt though, I am sure Playshare have a policy of only one welcome bonus over the entire group, yet none of this is made clear in the terms for Quatro, so I am not sure whether players who claimed bonuses at either Grand Mondial or Casinoshare are eligible for the welcome offers at Quatro.
Some of these new microgaming casinos may be "white label" operations, and others may be from less than upstanding operators. The days of being able to trust a casino simply because it was Microgaming are over.
One other recent newcomer is GoWild, again a botched launch, but they have managed to overcome these problems, and are probably going to be OK. I have played at Go Wild, albeit after the issues subsided, and have not had any problems, indeed, their payments are fast - I have recorded as little as 27 MINUTES between withdrawing and seeing the money in my Neteller account. They are slower at night though. These payment speeds are on a par with Club World and iNetbet.
On the other hand, it seems Eurolynx has popped up with an MGS casino called Lynx, and this has been the subject of slow payment complaints. I have also been told Interwetten is now MGS, but they had an issue that dragged on for months, and it was all hinged on SUBJECTIVE interpretation of "spirit" bonus clauses, rather than an actual breach of laid down terms and conditions.
Best to name names for advice before parting with any cash.