I play Harmonica with The Sunny Day Blues Band so I get through quite a few harps.
Over the years I've tried more expensive makes and models, with stainless steel reeds, valved, wooden/aluminium combs etc, hoping they will be better and last longer, but have always been disappointed with the results.
In my opinion, Lee Oskar's are the best value for money harps you can buy off the shelf. They are loud, have good tone, fast response and one of the easiest of harps to bend notes, so I especially recommend them for beginners.
The only other harmonica that I use regular is the Hohner special 20, which is very similar in all aspects mentioned, but the replacement reed plates that are readily available for the Lee Oskar, makes the Lee Oskar more economical.