For less than 100% finders it's somewhat dependent on subject matter in the context of having ample time to properly account for what's obscurred while composing. I'd much prefer a 100% finder but also appreciate the compactness and lighter weight of smaller bodies. Can't have it all in one so that's why I have too many cameras! On a similar note, some slide mounts will obscure a portion of the image. I find that quite irritating.