I have two 7 year old Yamaha YST SW800, both survived a surge that killed my 53" SONY RPTV and Yamaha DVD player, they are used almost on daily basis for watching movies, my friends also own various Yamaha subs, till date, they all run fine, of course Yamahas are not invincible and from time to time there will be problems but in terms of frequency, way less than other brands in general.