I use the DIY velcro strap and find it great
The pics on making one are at the MoS page but you have to register on the site to see them.
I use it with a small sicicone comfort sleeve with a bit of cloth underneath to stop slipping.
I have also used the vacextender which also works well if you do not overdo it. I used too much tension and got a blister. I now no longer use it because I also pump and am worried the combined use might stress my glans too much and lead to further blisters.