As everyone else has said they do make a difference. I have two 5645MG's and two 5625MG's in my Razzle. This plane is about the same size as the Cap Manaic.
Since I have two servos running the elevators I have used the programer to setup the servo's so that they throw the same. Borrowed it from my local hobby shop.
The 189 dollar price for four these servo's wether they are 25's or 45's is a really good price. Do you have to have them, No you do not. Are they worth the money,
Yes they are. The other big deal is that they are metal geared instead of plastic (for lack of better word at this moment) they do not have as much play in them as
compared to the standard servo's. What I will be doing is using carbon fiber rods and ends to give me better strength and such on these serveos much as I did with
my Razzle.

Since the manual has no recomendations for servo's but the Video page shows what they had for setup then I would not put anything lower than a 76oz servo which
matchs the torque of a Futuba 9202. Hitec no longer makes a 945 the closest thing is the 945MG which has which has 122oz at 4.8 volts. That will most likely be the servo
that ends up on my rudder. The throttle servo is the only one I have to think about as torque is not a requirement but would still like a decent servo on it.

Here is a picture of the servo's on the backend of the Razzle with the carbon fiber rods.
John