I've used a Titan manual battery. The button is located about 1cm from the atty end of the battery.
Yes, you do need to get used to positioning your finger or thumb on the button to activate it, but it isn't that difficult.
They do give you greater control / consistancy and for that reason alone many people prefer them.
Personally, I still prefer my EVO (obviously currently with auto batteries), but the manual battery will be fantastic for situations where the auto batteries have a tendancy to activate on their own. (eg loud music, driving, etc)
Thanks Angela. Do the batteries need to be any bigger?