Have been using NTUC for my car insurance for three years now, after switching out from AIG (which I had to use as part of the car purchase). Just renewed it for a year again because I think it's still very reliable. Many people have reviewed it and said the same, which I guess brings peace of mind even though it may seem wiser to switch to another provider offering a slightly cheaper annual cover. In the end, peace of mind matters more than a bit of savings especially if something unfortunate happens and you need to submit a claim.
I had to submit one claim during the past two years but thankfully NTUC made it very painless and quick. Online platform for checking policy details and so on is easy to use and no issues thus far. Haven't had to deal with customer service on a regular basis (which is a good thing) but on those instances where I had to, it was fuss free. Helps that there's a workshop near my house just in case anything needs to be done.