we purchase a BenQ pb 6100 . if the overall quality of the projector be fine , such be not the case of the lamp which blow up in less than 6 week !!! and worse benq do NOT honor they international guarantee and the support center do not respond to the email for exchange the lamp -lrb- price 400 $ ! -rrb- . overall a very poor support . my last boxlight lamp be still run after 4 year . this be my first benq but surely the last . a strong suggestion , do not buy BenQ .