Bobaa76

I have a 98 z28 m6 with 75,000. I inspected my tranny mount thinking it was the stock mount but it appears that previous owner installed an energy suspension tranny mount. How long do these things last and should i replace it. theirs no cracks or any thing. i just received prothane mount today. should i put that on or keep energy suspension mount on. any suggestion will help.
thanks