Ya, I bought my 1st camera (Minolta X700 plus 50mm lens) from Man Sheng in 1980s. Back then I was a poor student and thats all I could afford. Surprisingly the shop was very friendly to me. Nowadays whenever I go back HKG for holiday I will still drop by their shops.
Man Shing or Wing Shing prices are rather stiff i.e. no discount or a discount about the cost of a cup of coffee, so you won't get cheated. Those no name Nathan road shops will cheat you of your money. Some shops along Stanley road will cheat you too.