I've used the Leak Sentinel since they introduced version 3, I upgraded to version 4 a year or two ago and am quite pleased with it. Version 4 has temperature compensation and the ability to turn it off and not have to reset it later. I use it in an aquatica housing. I removed the external microphone, and installed the LS in that port. The manufacturer provides adapters for most housings. Before you decide I contact Vividhousings and confirm that they have an adapter for the housing you're considering. AFAIK you can use any vacuum pump as long as you have the small fitting that screws into the LS. Mine protrudes only about 1 to 1-1/2 inches from the housing and has never been an issue with fouling.
I have never tried any other vacuum system as I have been very pleased with the LS. When I first purchased mine, the pricing was far more attractive than either manufacturer installed or other third-party systems. I've not priced it lately to confirm if this is still true.
- tangfish likes this