I was curious about a head pump---and judging from number of comments, I wasn't the only one. As I'm quite familiar with penis pumping, I thought I'd take one for the team here and give it a shot to see how it worked out.

For the uninitiated, vacuum pumps all work under the same principle---removing air to increase blood flow to specific area. Typical uses include addressing ED (with placement of a cock ring post-pump) and pleasure.
Some claim permanent size improvements, I'm not one of them. I liken it more to going to the gym to work any other muscle or running to maintain the vascular system. What I've noticed as a regular pumper (usually sustained 20-30 mins daily), is when I do get hard from stimulation, my girth is consistently more than before I was pumping. My initial reason to get into pumping was to exercise my member. As a smoker (soon to be ex), I'm well aware of circulation issues that arise from smoking and wanted a way to keep circulation there intact. I do enjoy pumping---the feel of my cock in my hand post pump is somehow rewarding and my partners most certainly notice a difference when it comes time to tango.

With standard penis pumps, there are several basic elements. Here's a breakdown of the terminology I use:

Receiver: This is the "tube" portion of the pump, usually referred to as the cylinder in product specs. This is typically some sort of hard acrylic material.
Sleeve: This is the typically silicone or latex piece that fits over the end of the receiver. It can vary in length, which determines how much of the penis will be subjected to increased blood flow. A long sleeve may only subject the upper half, where a short sleeve may subject the entire shaft.
Release Valve: All pumps have some sort of release valve. This valve will allow air back into the receiver, thus releasing the pressure.
Pump: This is the mechanism for drawing the air out of the receiver. The 3 basic options are Bulb (like a blood pressure sleeve), Pistol (two levers squeezed, between palm and fingers that ultimately pull a piston), and Finger Piston (sometimes referred to as a "T").

The clear plastic receiver, at 2.5" diameter, seems wider than my other pumps. It's obviously shorter, at 4.5", given the purpose. The silicone sleeve was comfortable and the shorter length seems part of the design to better target the head. It has a 1" diameter opening, which is pretty standard across most sleeves. The initial smell dissipates quickly once unwrapped.

I liked the design of this pump. The detachable hose is knurled to prevent kinking. The release valve is glued within the outlet located at the top of the receiver. This allows for the hose to be detached and still have access to the release valve.

The finger-piston/T pump mechanism is comfortable in the hand. It's a pretty basic internal design utilizing a single spring. If used in wet situations, that could be a problem---but as someone who regularly pumps in the tub and shower, I wouldn't anticipate it. Just don't submerge the piston.

The 1" diameter sleeve is pretty standard and it's pliable enough accommodate someone a little bigger.

As with most pumps, soap and water will clean the receiver up fine, although it's not usually required with pumps.

I usually detach the hose from the cylinder when storing my pumps. This one is no different.

Par for the course with pumps, the receiver was shrink-wrapped (I think this is part of the sterilization process). The pump and receiver were both well wrapped in bubble wrap. I've never had a Cal Exotics product arrive with less than ideal packaging. The box is definitely not worth keeping. It's neither subtle nor made for long term use.

Having never tried a head-specific pump, I was curious to see how it worked out. I proceeded to try it, expecting my head to swell as what typically happens to my shaft when using a full-sized pump. When it didn't, I thought maybe the seal was a little weak. I tried another sleeve, same result. I thought maybe there was a pinhole leak in the seal where the release valve is glued into the outlet, so I placed the pump on my side and pumped. Sure enough, it sucked the air out. I removed the hose and the receiver stayed in place. Once I confirmed we actually had suction, I did another test on my nipple. It did indeed get sucked into the sleeve and stayed in place.

I thought perhaps I was letting the pump ride a little too far down the shaft, so I held myself behind the pump to essentially create a "stop", so the pump wouldn't ride down any further. Still no luck. I definitely didn't feel that intense sucking sensation typical with standard pumps.

I think the head doesn't engorge as I expected, as what happens to the shaft when pumping. Perhaps more head-pumping experienced folks could shed some additional light on this.