I don't have any experience with the wave maker you mentioned, but I know maxijet's have always been reliable for me. I had a few penguin 1140's for a while, both failed and I pulled out a maxijet that i'd had for about a 100 some years and it worked (still is actually) great... so I bought a few more 1200's.... great product if you ask me.
Did all three fail at once? Perhaps something may be wrong electrically with your wavemaker? If they all failed at one time it seems kinda odd.
That prob wasn't much help... just stay away from powersweeps I hear those things are the devil incarnate.
Cheers!