Get ENO Atlas straps and if you get on their mailing list, you can get 15% off here
I have 2 sets of them.
Literally any method of hanging your hammock would be better than the slap straps. They stretch like no other and you'll end up on the ground - and this only gets worse through the life of the straps. Because of this, you will have to constantly get in, get out, readjust, get in, etc. It becomes a pain.
If you like the ease of manufactured straps and don't want to fiddle with minute adjustments all day you can use Kammok Pythons. I have them and love them.
Same function as the Atlas straps but less bulky.
Ditto everyone else. They strech like crazy and you will be on the ground after a nights sleep
"When somebody moves something in your house, you notice it. When somebody moves something in the woods, I notice it."
-Tom Brown, Jr.