I use a pump to move strike water from my HLT to the mash tun. I've tried it with and without this nozzle at the end of the hose. The nozzle splatters water when my output valve is open more than about halfway; without it, I can open the valve wide open and mash in much faster. The downside is, I have to add the nozzle back on before I vorlauf.
Are there any drawbacks to mashing in more slowly with the nozzle in place, or do you generally use your sparging device to add the strike water (and I just need a less messy one)?