I have this device
(I also have the phallosan belt and stretcher as well as the andropenis stretcher)
so far there has been no perfect device if you have the money, each one has pros and cons
but speaking to this one
the anchoring at the pelvis is good
the springs are good
for me I am 7" fully stretched right now (hoping for 9" max stretch which probably is like an 7.5" penis...I'm about 6.5 bone to tip right now))
I had to make it as long as possible with the longer rods and I can get a little more length out of the device in the future by using the curvature bars and moving the clamp out.
It claims 30 min 2x per day vs 9hrs
I don't know about that, but a few things are good
PROS
1. it is backed by mayo so it's unlikely to cause damage if used as directed
2. the springs are strong (I usually ratchet it and release the springs, wait a few minutes, lock the springs and ratchet more and then release it again and then pull it open further with my hand so the springs can extend further (the springs are able to maintain this tension).
3. it goes straight out from the body (it's oriented better than any other device relative to what an
Erect penis would be angled at), this seems good because
Erect length is what matters most to me
CONS
1. it hurts like hell (in order to get it tight enough to pull hard I need to clamp it very tight) I can usually tolerate this for 30m, but it's the most painful device I own
2. it's easy for the glans to slip out of the vice grip (I have tried small rubber sleeves on my glans as well as the 3m medical tape it comes with (I purchased a lot more).
(1&2 are related...like to prevent 2 you need to suffer 1, you can find a balance, but it's not great)
EDIT
I just started using these amazon.com/gp/product/B082VZG9RY finger sleeves (AKA Finger Protectors, Finger Cots,).
They are very thick and a bit small even for my relatively small
Flaccid glans (however they are stretchy and for 1 hour of wear even a much thicker penis would be fine in them)
The cushioning and padding of these thick finger cots makes the device way more comfortable for up to an hour.
I like that this device is Mayo Clinic backed and designed for peyronie's disease and thus unlikely to cause excessive tissue trauma that could later induce scar tissue and ironically peyronie's disease and thus shortening...exactly what we don't want. Thus, given these cots plus the device plus my technique I feel I get the max amount of safe stretch from it...a lot but not too much.