What kind of model are you building? For a full-banger pattern ship or a 3-D model they may be disappointing. For a less precise model probably fine.

I usually trim my models on the first flight of the day anyway and one "blip" on the trim button isn't much of an inconvenience. Offset that with the benefits of no potential metal-on-metal radio interference, no radio shadows from the metal, ease of installation and light weight (lighter flies better).

Life is full of compromises.