Saito 100's are very good motors. I have 4. Saito is coming out with a 115 and you are right it does have the same case as the 100 but, if you want the best motor for any .60 size plane try the Saito 125. The 125 is the absolute best motor for any .60 size plane. It has the same footprint as the 100 or Thunder Tiger, OS, etc. .91. The 125 makes about the same power as my YS .91. The only motor that beats the 125 is the YS 110. YS's do however require a great deal more care and attention than the Saito's.

When I first started running the 125, I thought the motor was junk but, after putting about 2 gals through it, it only then began to be powerful.