The screw comes loose on one side. The bridge can bend easily. The screw came out on my brothers head which is larger then mine and while that may be funny, I only tell you this because it may not be an optimal choice for larger heads. They feel comfortable, lightweight ( due to lack of long term durability) and worth the price.

If you prefer multiple styles then buy cheap sunglasses that don't last very long and change them around.

I have friends who style multiple expensive glasses, ones who wear one pair of expensive glasses and ones who own tons of cheap glasses. It's a different style to own cheaper glasses, it still looks good but you're not on edge about loosing or breaking them all the time.