I've got a basic one that a clubmate gave me some years back. It was really for a Scout activity - we had them "racing" on static bikes. I tried it the other day, and it's so noisy that I don't dare use it even in the back garden! Also it's a fan-resistance model so it doesn't really give much resistance. I think my ideas of trying Zwift may have to go on hold. Luckily my wife has a very old, traditional, but fairly decent exercise bike, made before anyone had ever heard of connecting the things to anything. It does a few programmes, but the controller runs on a couple of D cells if I remember correctly.