I don't think A/R's are a compromise at all in spinners. The large size of the rotors allows very big diametre AR bearings to fit and these are very strong and efficient ie because they are generally larger in diametre they have more mechanical advantage (read leverage) over the shaft they are looking to stop. They also act on the rotor itself rather than the handle shaft which is mechanically superior. Its a different story in overheads. Firstly compact modern jig reels don't have the space available (like eggbeaters) to have oversized AR bearings. In addition, if they are to achieve free spool, the bearings must act on the main shaft/handle. The frozen spool can only act on the AR bearing first via a gear set which is not as precise and results in alot more backlash. I think that in overheads depending on AR's alone, or pairs of them in the case of a lot of accurate overheads, might not be the best case scenario - no coincidence then that if you read US threads there are alot of twin AR bearing failures in the Accurates they love so much. If the AR's alone aren't atleast a little inferior, then why are the yanks absolutely butchering their reels with aftermarket double dog mods that compromise the reels waterproofness and void there warranties. Dogs act as more of a backup in modern eggbeater reels, but they are far more important in overheads.