Vintage Overdrive : Why four monkeys?

Today almost every metal guitarist have an overdrive pedal to boost their amps. I was among those who didn't... till today. My first overdrive pedal was built in usa and made by expensive brand, but I didn't like how it sounded. I felt los? of lowend and it changed the sound so much that my amp was loosing it's own tone. I sold it and haven't tryed any other pedal. But once I decided to buy a Harley Benton Vintage Overdrive just for fun and try because of it's low price. And it suprised me very much! Maybe it looks funny, yes - its cheap, yes - it's a copy of tubescreamer kind pedals. But it sounds like expencive high quality effect pedals. I'm wondering how they did it, but it lets the amp breath with it's own sound. The pedal adds more bite, tight and without any lowend loss. To my opinion, only one minus of the pedal is that the lower part of pedal's housing made of plastic. The second - the placement for the battery isn't done very well. But, this two facts means nothing, when you hear the sound and see the price.