Like many others I was sceptical about the claims of this product, but after giving my husband years of sleep deprivation, and after having been jabbed in the ribs afew too many times, I read through the reviews and thought I'd give it a try.
The first night I tried it, my husband reported my snoring had vastly reduced - still there, but at a much quieter volume - he could sleep fine, so did I, and I call that a success!
Customising the fit needed to be done a couple of times initially, and does need to be repeated from time to time. It did take a bit of getting used to, and for the first week I drooled a bit, but you do get used to it, and you do stop salivating so much.
Loud snoring since buying the product has still occurred - but only because of human error - I removed the snore guard before I went to the loo, and went back to sleep without putting it back... the complaints the next morning were enough to make me more careful in future.