Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Questionable reliability, *very* heavy

Tnis string trimmer worked well out of the box, those it was *much* heavier than my previous Weedeater Featherlite. It did a better job than the Featherlite in long weeds, but still bogged down from time to time, which surprised me considering the unit's heft. The buump-and-feed mechanism was also less than ideal, causing me to have to stop the trimmer frequently to "manually" let out more string.But these quibbles became moot after the trimmer ceased to function after using it on a very hot day at the end of July. The unit will now only run for a minute or two; after warming up it stalls and cannot be restarted. It would appear that it overheated on that hot day and is now seriously damaged (and yes I did use the proper 40-1 oil mixture).BTW, the Troy-Bilt gas trimmers are manufactured by MTD.