1. There are several grammatical errors and typos, etc. You need to edit language files to fix them. This is really easy to fix.
2. If you change the size of thumbnails for ads module, it somehow changes the sizes of all images, not by pixel but by percent, which is strange. Changing ad module's thumbnail shouldn't effect other images. This is not easy for us to fix, so developer should think about it.
3. If you edit css and language files, back them up first before update, it will overwrite your edited files and you have to do it again. Plus, when you update the extension, the new extension has more styles added in the css. So you have to add them manually to old css. And, I hope they do not changes style ID/Class names. If they stay the same, we could use our own css files, so updating will be easy. This CSS problem is also really easy.
Other than those 3 problems, it is a perfect extension! You will remember this review if you start using this extension.
Please make this great extension to be even more super fantastic and amazing!
Although, it doesn't work right out of the box, you have to fix, tweak and adjust several things, inside and out, before you start using it. Since it's free there is no support. You are on your own on this.
The only problem is that if your ad is unpublished, you can't see them in "My Ads" page. Developers said they will fix or add this in the next version, 2.7. Hope the 2.7 will better than 2.6.
Sorry to learn that you have problem with paidsystem. You speak about the slider modules, since 2,3 months, the slider modules has been updated to jquery instead of mootools and this version no one has reported any issue.
Currently, if you check our ticket support system you will see that there is no "major blocking issue", did you try to contact us by email ?
There is no php error currently reported right now, so I don't understand what you needed to fix ? (Please note that if you are using a beta or RC version, bugs can be there, only stable version should be used in production right now, that's the normal process).
In any case, you could contact us again by mail to resolved your remaining issue or to gain your money back if you change your mind and you are no more using paidsystem