I use them now. They are absoutely amazeing. When you blow a fuse, you need a new fuse. When you pop the breaker, you go to under your hood, click and push the botton back and its brand new working again. Just like a house circuit breaker. Its an easy way to descirbe it. They are very reliable and i use them when i upgraded my big 3 from alt to battery positive and from my postive to my postive of my second battery. Blew it once and pushed the botton back in and worked brand new.