Pros: Great when they work.
Cons: Inconsistent burn speed and occassional fail discs burn.
2 x ASUS 24X DVD Burner = $30 (Fall 2010) + generally satisfactory results/performance.
2 x Samsung 22X DVD Burner = $60 (Spring 2010) + inconsistent burn speed and some fail disc burns.
Samsung are probably the best in making memory, but they sure can't make solid optical drives.
I had other Samsung optical drives in the past... and they went "malfunction" eventually.