I went 3 lazy years without a motor cleaning on the 150. All I did was swap cages and sometimes soak the motor in vinegar. I swear I thought I would've had it forever but it was time for an upgrade. Once cleaning I finally gotten to take the motor out and the shaft was split.
I think the 200 series is the best gyre, I had just switched to the 350 and am not so much excited about its design. The magnet is not strong at all. Doesn't come with extra cages or bushings, and overall the new flow guards aren't all out to what it "looks" to be. They upped aesthetics but took some key components away that had made the gyre worth it to me. I've used tunze pumps when I first got into the hobby, without a doubt the best power head but theres nothing like the performance on a gyre pump. The streams are insanely powetfull, good for a large system.
Overall I think the maxspect gyres are the best pump on the market, I will never have a system running without atleast one. The pricing is also fair especially if you catch them on sale.
Look at the size of the tunze impeller LOL