I'm so glad that I tried this before having another custom guard made.
I have pretty severe bruxism with chronic jaw pain, and I am very pleased with this guard overall.  My custom $800 guard was worn through, and my current dentist wanted me to get one similar to this design, which would cost me around $450.  I thought I'd try this for a few weeks and see how it goes.  I haven't had jaw pain in weeks.  I'm so glad I gave it a shot.  I did not have troubles molding it to my teeth.  I found it very much like all the other guards we've done for sports over the years.  There are two flaws that made me hold back that 5th star.  One, though minor, is there is a sharp bump in the front of the guard that I had to smooth down with a hot butter knife, or it pokes my upper lip.  I can still feel it a little, and should probably try to melt it some more.  Also, and most importantly, like others have noted the back that goes against your pallet is very thick.  Try to squish this with your tongue while forming it, the best you can.  It made me gag a bit while putting it in my mouth, and taking it out, until I got used to it.  Those flaws aside, I will continue to use this guard, and reorder them as they wear out.
Rating: 4 stars