I have completed some extensive research into devices to help with Erectile Dysfunction.

One method that many reported successful in extreme cases of health problems such as Prostate Surgery, heart disease & diabetes is the Penis Pump.

There are two major categories of Penis Pumps.
1) Used only to enlarge penis size (cannot be used for ED)
2) Designed for Erectile Dysfunction. This model is designed to place a cock ring over the penis before removing the pump.

I have found the Pos-T-Vac BOS2000 electric Vacuum ED Penile Pump System to have the best features to make it easy to use. The special Cock Ring Loader makes loading the cock ring fast & easy. The Cock Ring Loader:
https://www.youtube.com/watch?v=gN2Hnmg6JF4
How it works:
https://www.youtube.com/watch?v=l2Qxpnh-8_U
Amazon.Com for testimonial reviews:
http://www.amazon.com/PosTVac-BOS2000-2-Battery-Vacuum-Standard/dp/B001GJ8PGK/ref=cm_cr_pr_sims_t

The Pos-T-Vac beat out the following models in my research:
* Paneg Penis Pump:
http://www.amazon.com/Manual-Operation-Vacuum-Enhancer-Instrument/dp/B00LHCFHJE/ref=sr_1_6?s=hpc&ie=UTF8&qid=1420192168&sr=1-6&keywords=penis+pumps
* Primus Penis Pump:
https://www.youtube.com/watch?v=943E-FYyT_c
* Encore
http://www.vitalitymedical.com/encore.html

Encore ran a close 2nd, because it required manually loading the cock ring, where the Pos-T-Vac had the EZ cock ring loader.

For complete details on my Erectile Dysfunction Research,
http://tinyurl.com/Iodine-Erectile-Dysfunction

Does anyone else have experience with Penis Pumps to hold an erection? I would love to hear from you.

Best to all,
Grizz