i got this lamp several years ago and i just love it. the only problems i have are little flies that were attracted to the lights got stuck inside the grooves of the light bulb bases. my patio door is open at night so i can't keep them from sneaking in. they probably love the lamp too! I'm not really sure how to get rid of them, but I'll be checking with the manufacturer. another issue has been an electrical short or something happened to one of the sockets. but with a little twist of the bulb it works. I'm no electrician but i may have put the wrong bulb in or something like that... all in all it's so worth the price. it's sturdy and feels really substantial. and these issues can be corrected very easily and quickly. 
also, remember DO NOT use window cleaner or any chemicals. just dust gently and wipe down with a damp cloth.