I have wired and wireless releases, but most of the time I am quite content to use mirror lockup and the camera's self timer. If the timing of the shot is not critical, which it often isn't for landscapes (at least not to the precise second), then the timer works quite well enough. I do notice when using a long lens that the 2 second timer is probably borderline and I usually play safe with the 10 second option. If precise timing of the shot is important then either remote release will do just fine.