Some constructive criticism:
- Gui looks pretty bad
- Code is needlessly complicated.
- Code is needlessly complicated. (listed twice because I really wanted to emphasize on this.)
I don't like people using things that can be made better, and you decided to plaster your name all over it soo...

I made this 20 minutes after you posted this.
I think the total code of mine is like, 40 lines in total. Perhaps you should download it and take notes.
Download: https://dl.dropboxusercontent.com/s/jybuuyejetu5ewj/Script_QuickLoad.zip
OK mang, we get that you are a better coder than this guy, but I think that this is really rude. You literally just said in different words "Look, I made this in a fraction of the time you did, and its so much better"
What would you do if you made an add-on topic, and then a better coder than you, LITERALLY MADE A BETTER VERSION THAN WHAT YOU DID AND POSTED THE DOWNLOAD LINK.
You wouldn't like it, right? I understand that Setro's add-on might not have been the best, but it would be great if you didn't stuff on his work. I may be taking a bit of offence by your post, mostly because
Summet did almost the exact same thing to me, except he at least didn't remake the whole damn script. he actually gave me credit. If you are going to criticize, then don't be all "Ok, so. Your code is stuff, and it looks stuff. Here is a non-stuff version."
You can give input, but do it in a way where you don't make an add-on that does the exact same thing, but better, in his own damn topic. This topic is about Setro's addon. not yours.