So my old Weedeater brand trimmer has finally crapped out. Gonna spend a little money this time and get something quality. Have decided on a Echo mainly due to the 5 year warranty. My dilemma is whether to get a curved shaft or straight shaft model this time. I've read straight shaft is better for taller people but I'm 5'8" so I don't think that applies to me. My old one was curved and my only experience with straight ones has been fondeling them at the store. Both feel fairly comfortable to me. Use will be once a week for about 30-40min max. Any input will be greatly appreciated.