Four foot high, bulb lit, and positioned so that by the end of the night literally every guest has stood in front of them for a photograph.
Light up letters do something no other decoration manages, which is give people a reason to gather. LOVE behind the top table, initials framing the dance floor, MR & MRS as a backdrop, or your company name at an event where the photographs are going somewhere. Warm white bulbs, dimmable, and they look as good at eight in the evening as they do at midnight.
Delivered, set up and collected, so it is one less thing on your list. And they will be in more photographs than almost anything else you spend money on.