Soldato
If battery, make sure it's a Li-ion variant - I have a Bosch Ni-Mh or Ni-Cad and it takes ages to charge and doesnt last long.
Similarly, if going petrol, go big or go home (cost/quality wise). I bought a Ryobi petrol brushcutter as I got a good deal, and i've had problems where I can't use it for longer than 20 mins otherwise it will start to surge or over-rev. My lawnmower guy won't touch it as it uses a cheap Chinese carb and says they are just junk. It only has a single adjustment screw which isn't designed to be user-adjusted, so I had to dremel a slot in it to adjust it (to not much effect I might add). 20 mins is on the cusp of how much I generally need to use it so it's not too much trouble, but now with hindsight, I wouldn't buy anything that isn't Stihl, Tanaka, Efco or similar grade. It really is a case of buy cheap - buy twice. I now have a Tanaka hedge trimmer and the difference (engine wise) is night and day, particularly with starting it.
Similarly, if going petrol, go big or go home (cost/quality wise). I bought a Ryobi petrol brushcutter as I got a good deal, and i've had problems where I can't use it for longer than 20 mins otherwise it will start to surge or over-rev. My lawnmower guy won't touch it as it uses a cheap Chinese carb and says they are just junk. It only has a single adjustment screw which isn't designed to be user-adjusted, so I had to dremel a slot in it to adjust it (to not much effect I might add). 20 mins is on the cusp of how much I generally need to use it so it's not too much trouble, but now with hindsight, I wouldn't buy anything that isn't Stihl, Tanaka, Efco or similar grade. It really is a case of buy cheap - buy twice. I now have a Tanaka hedge trimmer and the difference (engine wise) is night and day, particularly with starting it.