I've been using a Braun/Oral B electric toothbrush combo for many years, and see no reason to change - I did use another manufacturer's electric toothbrush for a while and while there was nothing wrong with the toothbrush itself, it was the shoddiness of the brush heads (bristles coming loose and fraying) which led me to hurl it into the bin and return to Braun/Oral B
I already use 'Precision Clean' Oral brushes, and these are a revamped and upgraded version. The brush heads do look a little more bristly (Oral B say 29% more bristles than the older version). I can't say I notice any difference in how my teeth feel after brushing - but then, I stick with Oral B, and like the Precision brush - whether the old style or the new style, because my teeth always feel properly clean after brushing anyway.
A big advantage to electric toothbrushes, noticed both by me and verified by my dental hygeinist, is that over-enthusiastic brushers are less likely to be brushing the front surfaces as hard as they might do with a manual brush, which ultimately can damage the gums. You just rest this one against the teeth, switch on, and away it goes.
However I'm enormously surprised at the comment on another review saying 'you can get 6 months use out of this' Dentists may well recommend changing the brush heads after 3 months - I generally change mine every month or 6 weeks. Oral B have a colour change indicator on the outside bristles (they get paler) to tell you when its time to change, and mine indicates time's up - and I notice splaying of the bristles - in 4 to 6 weeks. And no, I'm not an obsessive brusher - twice, or three times a day