In your own opinion, what factors contribute immensely to customer's satisfaction: quality, price, usage experience, after purchase service?

All of them.

Depends on the product you are selling and the target you are directing your actions.
A luxury customer doesn't value the same things as an industrial customer, a service customer, or a daily products consumer.
Tell us what kind of product you are talking about and I will give you my opinion.
Best regards.

It totally depends on the product ur buying. But generally, according to me it should be quality, usage experience and for retaining the customer after sales service is of utmost importance. Customers are than willing to pay whatever price if all these things are in place

usage experience

For me as a customer quality is the best or prime factor to be considered. The quality of certain product justify its cost. I dont mind paying much as long as I am satisfied with what I get. If I could get it in a much lower price then I could say it would just be a bonus.

Customer satisfaction means,When a customer get convinced with your products or services NOT by getting confused with your sales/marketing person and when they come back to you for another deal.

Irrespective of the products or services that you sell to your customer, following things determines the customer satisfaction. Your Price and Quality will attract the customer to your product.Usage experience will decide whether your products is really convincing to the customers.After purchase service will get recommendation to your product in the market.

Conclusion: All above points matters step by step. 

In fact customer keeps an eye on all of the above.  But, what matters is the continuing relationship after the sales.  What differentiates a "good" company to a "great" company is that the latter continues to get the customer involved via frequent phone/email conversations as t:

(i) How do you like your product that you have recently purchased from us?

(ii) What other improvements that we need to make in the future generation of this product to be more customer friendly and more user friendly?

(iii) Do you think you have received your money's worth with this product?  If not, what do you think the price point should be for this product?

 

Companies should always look at the CMU (Changes, Modifications and Upgrades) to the existing product(s) to continually engage the customer as well as keep them away from the competitors.

of course usage experience

Quality of products is always remind your mind.wow what a product.

It depends .
But the availability of the serivce itself when needed is the most important.
How fast you respond to customer can determine your price the faster you solve the problem the higher price you can get, the slower you respond the longer negation on your bill you will face.
I can say "time".

It totally depends on the products for example  if I buy a laptop so definitely I am looking for quality and after sales services.