Hello mate, I've got the Harris 13.5-27inch swivel base (model s-25c) excellent bit of kit, rock solid very well made, got a smaller Harris copy only use it for bench testing now & the build quality is nowhere near, kneeling or sitting just the job, wouldn't be without mine use it out stalking all the time, got mine from uttings few years back not cheap but you get what you pay for, hope this has helped mate, cheers Nick !