All of the four stroke engine brands are good. I really like my Saito 91 and Saito 90TS. Both are strong, the twin is very, very sewing machine smooooth. The Saito 100 is said to be a little rough running but that may change after a few gallons of fuel. The Saito 91 is happy with a APC 14X6 wheras the 100 is happy with the 14X8.

I know that Horizon gives very good service on their Saito engines. I have never had any problems with bearings except for a OS 160FX front bearing that has a little play if you wiggle the prop tips. It still runs fine but I will probably replace it anyway. I always run Byron fuel and never have any rusting problems.

With any manufacturer you can get a defective part or lemon. I think with the less expensive brands you run a higher risk of this. It is the reps service that wll make the difference.

I had the Saito 90TS in my Spacewalker with a Higley heavy hub and thin nut with a Cline regulator. I also built a motor box to move the engine as far forward as possible for balance. The plane was a joy to fly and it flew very scale. You could do hammerhead turns, loops, and cuban eights but had to dive to get the power to go over the top. It was really cool. I have a OS 160 twin in it now and is grossly over powered and feels much heavier to fly but is still at 10-11 pounds. This engine is also very nice and smooth, there are several used for sale at this time in the marketplace