HZR vs. HZglad to here your getting a 105!
-as for the HZR the motor is very consistent and is smooth throughout each flight. if you are using a clunk, fuel magnet or bladder system its great on all of those applications.
-as for the HZ version i have not tried yet, but all i have heard was good things about it. if your looking to get kick ass motor and not spend the extra money for the HZR get the HZ and you won't be disappointed.
-currently i am using a fuel bladder in both my ENV nitros and the motor seems to be even better running than with a fuel magnet. the fuel magnet is a great thing but if you're looking to get every last bit of performance out of your motor and every drop of fuel out of your tank without ANY air the bladder is a great thing to do to your trex 700.
-if you have anymore questions feel free to PM me