As a longtime LR & Mac user, I am finally coming around to understanding the benefits of a Wacom tablet versus my trackpad for post-processing. Since I am sure that many of you are veteran Wacom tablet users, I would like to lean on you for a recommendation. Specifically, what features & size of tablet do you find indispensable? I don't want to "under buy" & later have buyer's remorse. Likewise, I don't not subscribe to the dictum that bigger & more expensive are always better. So your experienced thoughts would be most appreciated. Thank you kindly.