The films serve its purpose fully. The quality is good in my opinion. Bubbles have not formed with me, however, it is a little "Sysiphusarbeit" to place the film properly. The problem, however, arises when all slides ;-) For this price, there is a strong buy recommendation from me, even though I do not know why there are on the left side next to the hole an elongate recess. This has no function in my opinion, that bothers me the look of the terrible.
