I too have been worried about the screen falling off if the adhesive strips turn out to be low-quality. So I took the precaution of internally using a cable tie coupled with two adhesive-backed cable tie-downs (like what you would use to fix Ethernet to a skirting board) so that if the screen should become detached, it can only fall forward maybe two inches before being restrained by the cable tie (http://macs2u.co.uk/imac-screen-restraint.jpeg). Hope that idea is useful to folk, could save serious embarrassment and expenditure.