I have the same one and it does reverse tumble. Only sporadically but it's enough - I haven't had balled/tangled sheets once in about six months of ownership with 4-5 cycles per week. Amusing because basically all the negative reviews say it can't dry sheets. I have no idea what they're doing.
Probably putting too much in at once. I have seen so many flatmates pack the thing full after packing the washer totally full and things dont dry well. The washer gets them wet so they assume cleaned even tho it just rotated as a single mass in there instead of tumbling.