I haven't seen that faucet in person. It is nice-looking, so I went to the Elkay site and looked at the specs and drawings. That got me confused. Do the spring-flex hose and spray head detach from the horizontal arm, so that the spray head can hang free and be swung around? I've used a regular (commercial) pre-rinse spray faucet. They are usually much higher than that Elkay, the spring-flex hose hangs freely and can be pushed out of the way. You can add a regular spout too. The link below shows you how high a regular pre-rinse faucet is. Here is a link that might be useful: Chicago Faucet - Single-Hole PreRinse

We have this faucet. It works very well with our deep one- bowl sink. The answer to your question is no and yes. No you do not have to hold the button down to keep the sprayer running if the water volume is sufficient. If the water is only slightly on with a small spray of water you have to hold the button down to keep the sprayer running. It seems very well made and substantial in weight. We bought ours on ebay from Mayfield Plumbing. They had the best price we could find after much research and the service was great.

To chime in here--I have a Kraus 1602 (or perhaps the 1600--they are very hard to tell apart) and am very happy with it. Here are some of the features I wanted--I wanted both the sprayer and the regular mixer (spout) to have independent volume controls so that either or both could be on at one time. And I wanted a latch to lock the sprayer in the "on" position so that the spray could be used without having to hold the sprayer. Also the temperature and volume control moves from the 12 o'clock position (cold) down and toward the front of the sink for hot water. This is great if you are worried about the space between the back of your sink and the backsplash. The one issue is that you need to give plenty of space between the hole for the faucet and any hole for the soap or hot-water dispenser that will be to the right of the faucet--at least 6". There was nothing special about the installation and it seems very solid. We use ours with a Touch Master foot pedal and it is a great combination, but I don't think guests will be able to use our sink. I'm going to have to write up instructions. Here is a link that might be useful: residential pre-rinse faucet

I assume pre-rinse comes from the stage in commercial dishwashing where you rinse off all the food before running it through the huge sterilizer. It requires a nice strong spray to jet everything off the plates. I was thinking to get one that extends beyond the sink because this is for my prep sink which is in my main prep area not far from the cookstove, and it could double as a potfiller at need. I could also get a regular pullout style, but am rather taken by the option of having both rinse head and regular faucet head on one stem.