My strimmer didn't start at all. Only after receiving additional starting instructions (not the first time this has happened then) did it eventually start only to use a tank of fuel in 10 mins and then refuse to start thereafter, hot or cold.
SGS were reluctant to admit a fault but eventually had it back for investigation but after keeping it for 2 weeks sent it back in the same condition.
I then had a saga to obtain a refund which took a lot of chasing and contacting my credit card company. Overall the experience lasted over 6 weeks and is not one I intend to repeat!