It's worth entertaining a call as these guys can also offer you a good insight into a health insurance plan. The real problem with buying a health insurance is you are not certain whether you would have a critical illness and whether you should buy the same. We hope God continues to bless each one.
Apart from that there are a whole lot of considerations and it's not only about the health insurance plan per se. First, you have to study the amount you want to be covered with and do a comparison premium. Then you need to see which insurance service provider covers till what age. Not all cover you beyond the age of 70.
Then you have to check for other benefits like disability coverage by way of accident. Apart from this you have to also think of whether a particular service provider is providing an extensive coverage of hospitals, particularly under the cashless hospitalisation category.
In any case another important fact is to study the claims policy. This cannot be done through any portal, but, only through people who have had experience with a particular health insurance service provider.
It's best to check with family and friends before you decide. Some portals will help you compare important details, but, will not be able to shed light on how good the company is when it comes to claim settlements.
In any case the mantra is to compare, ask and compare again. You can't keep changing your health insurance provider, as you would lose certain benefits staying with one provider. Doing an online preliminary comparison could indeed be of great use.