I see a lot on here about not buying an entry-level bike with discs because disc brakes at that pricepoint suck. I have a trek 4300 that I bought last year. The brakes are shimano m465. They will stop on a dime no matter what conditions I'm in. If I get on them hard they lock the wheels and I skid but if I use them right they work great. Please tell me what better brakes will do differently.