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I've used it once or twice.
Its great stuff I always over order as it's hard to guage how much you will use as you have to stretch it to get it into the gaps. Last time I used it I ordered the exact amount of the length of gaps to be filled and used about half. It wasn't a problem though because the customer service of the company that supplies it is excellent and they refunded me for all the unopened boxes within a day or two of receiving them.
This stuff is better than pine slivers, easy to fit and not too expensive either.