This is a very good mat for my stackmat G4 timer (not compatible with the G5 or G3). It is very useful for my 0.1 TPS solves (only joking (kind of)) It prevents damage on my +10 minute megaminx solves and stopped my 4x4 4 minute+ solves from damaging my main. Except the best thing is that it helps my 2x2 world records at home (scramble: F2 R2 U F2 R2 F2 U R2 U). I have always recommended Kewbz to my friends and it is no surprise that postage was quick ect. Overall, I would recommend this to all people with a G4 timer as there is high quality and great shipping