Product review (4 stars): Fits perfectly, no way do you need to replace every 3 months!
You either own the range that uses this filter, or you don't, and if you own this range, you do need to replace the filter every so often!  This fits perfectly if you have this model of stovetop.  It had probably been a few years for our stove, not sure if/ when the previous homeowner last replaced it.  But as for the recommendation to change the filter every 3 months, I think that is probably waaaaaay to frequent.  Mine has now been in there for a good 4 months and it still looks brand new.  I cook a pretty often, not every single day but probably about 5 dinners a week plus maybe a nice breakfast one day on the weekend.  And I would say that I am messier than average, in terms of drips and what not!  I'm going to set a reminder to check on this every 3 months, but unless you are a short order cook for an army, you probably don't need to replace this thing more than once a year.