Yes Enyas last for years,i have 10 of them over 30 years old and they still run fantastic! The secret to Enya engines is to break them in with a size larger prop then u plan on flying them with. ( flying with a 10/6 - break in with a 11/8 ) Also try to find the hottest Plugs u can for them,the OS#8 is a exellent plug,but fos rc longs work great to. Run them using a caster/synth blend and 10 to 20% nitro. You'll get many happy years from Enyas.

Good Luck
Art