I’ve got the Stihl AK series. Blower has been great. Trimmer had to be serviced under warranty. Gears in the head melted. Apparently they’ve since switched to metal gears instead of plastic. Haven’t had any issues since. Yard is just shy of quarter acre. Can usually make it on one battery. Batteries are interchangeable throughout the AK series. Trimmer and blower each come with a battery so you end up with tow batteries and two chargers.