There may be more differences than I can recall at this moment.(Creeping old age!!) Nevertheless, here are a few just off the top of my pointed head.
I have had the
Bathmate x30 longer and have worked out most of the self-inflicted problems with its use.
I use the
x30 with a
comfort pad and the
Penomet with a single black gaither. Both are used with the vaccu-vin mod.
There are many more similarities than differences, but you asked for differences.
The
Penomet is larger and more difficult to use. It is easier to use if you start with a full blown erection. I can usually get to my max pressure/inflation(never the limit of the device) without
having to restart the
x30. The
Penomet usually takes 3 or 4 refills b4 I reach max inflation.
The
x30 has a much more convoluted valve and is much harder to clean. The
x30 w/o a
comfort pad is painful in the areas of contact with my abdomen, especially in areas of hernia surgery.
The pad eased that discomfort and with a good lube is easy to use.
The
Penomet's black gaither seems softer and less harsh. Probably why the vacuum seems less than the
x30. (w/o the mod).
On both I pump 3 or 4 times then add the mod. After 2 to 3 pumps of the vaccu-vin I am where I want with both devices.
The mod is easier to use with the
Penomet and it seems as though I could add much more vacuum with the
Penomet. However, I have no
desire to injure the only dick I have.
Both devices are quality pumps and with the mod are all anyone would need in a
penis pump.