I guess thats a matter of personal preference. Got the model for free, so I didnt mind spending the money on them. They do add a bit of detail, but most of it is on the underside anyway, you could definitely have a nice looking model without them.
I'm going to redrill out all the acrylic I put in the upper saucer, and make them bigger, then redo the acrylic. I'm not looking forward to that, but I think it's for the best as some are just too small.