Hello Peter

My 170 cdi have 184 flights (each flight last about 18 mn).
Its' very reliable. The only changes I do are replacement of pump after 77 flights and spark plug after 46 flights.
Propeller APC 19x11, fuel is 6 % oil and nitro 20 %.

I'm waiting 175 cdi so I dont know it . But friends of mine as Loic, CPLR , Cedric and others told me it's more smooth and iddle throttle is lower.

I fly also with friend's electric patterns but flight is too short for me (about 7 mn). If I want to do 3 flights , I need about 8 batteries to do the same duration of flight.

Claude