I find that Gepes aren't very expensive (and I am a tightwad.) There are far more expensive cable releases out there. Gepes really earn their worth if you have a double action shutter like an Ilex Universal, as they have a longer "throw" needed to cock and fire the shutter in a single depression.
That lock 'at the top' is a Zeiss Disc-lock. The cheaper locks have a little knurled screw to hold the cable (and shutter it's attached to) open.
Nearly two decades ago I followed Bob's advice and tried a Gepe. I'm glad I did since most of my shutters are double action.
You can look for Gepes and other cable releases with a track record for service in used baskets---if found they'll represent quite a bargain.
Until I started large format I bought cheap cable releases---they'd work for awhile then I'd wear them out and get a cheap replacement. That can certainly work for you until you run into double action shutters or go on trips where your cable release takes a dirt nap 8 miles from the trail head. Then quality (notice I said quality, not expensive or trendy) becomes more of a consideration to be taken seriously.
I built my 8x10 kit on a woefully tight budget. After awhile, once a year I'd treat myself to upgrading a piece of sorry equipment (preferably purchased either used or on sale)---loupe, light meter, filters, dark room stuff, etc...and for a couple of years it was a Gepe release. I have to say my modest assortment of Gepes have and continue to serve me very well.
Thank you Mr. Salomon!