The Bigen Cream Color 4-0 Dark Brown is decent, but it didn't completely cover my gray hair. I had to apply it twice to get the desired result. The one push application is convenient, but the color payoff could be better. Okay product overall.

I had mixed results with the Bigen Cream Color 4-0 Dark Brown. The one push application is convenient, but the color turned out a bit dull and it didn't fully cover my gray hair. It's an average product for me.

I'm really impressed with the Bigen Cream Color 4-0 Dark Brown. The color is beautiful and looks so natural on my hair. The coverage on my gray hair is excellent and it lasts for a long time. I will definitely be buying this product again!

I've been using the Bigen Cream Color 4-0 Dark Brown for a while now and I'm quite satisfied with the results. The color is rich and the coverage on my gray hair is good. The one-push application is a nice feature, although it can be a bit messy sometimes. Overall, a great product.

I recently tried the Bigen Cream Color 4-0 Dark Brown and I must say, it gave me a nice, natural dark brown shade. The one-push application is really convenient and the coverage on my gray hair was excellent. I was able to save the remainder for my next use, which is a bonus. Overall, I'm quite satisfied with this product.