I use this jack and I love it. It's the only one I could find that could get all the way under the car without me having to use the scissor jack at all. I am dropped on eibach springs and I do use a makeshift "ramp" I made from 2x4's for the front though but that's not hard to set up. Made life so much easier working on this car.

Man this thing drops the car when you try to lower it.

When you tighten the valve, it just needs to be snug. You don't have to put it in a bind. Just like with oil filters. This will give you more control when you go to open the valve - much less likely to "jump" open.

Late edit: And since you will keep body parts from underneath the car whilst using the hyd jack and will be using jack stands to hold the weight of the car once it's up in the air, it's not a big deal if the hyd jack bleeds down a tiny bit.

turn the handle gently using both hands when you want to lower it.

or twist it real quick for Race Car

Thats what I did, then the front bumper landed on the handle bar :(