Moreover, almost everyone is nowadays used to clicking on the picture to go to the next (or click on the left side to go to previous picture). Therefore, any gallery extension like this should definitely consider having this feature.
So, if this extension had BIG buttons, more space between them, and could be navigable through clicking on the images, I would use it. But now, I leave it for the next update!
I have first installed it on a website that got hacked 3 times, and took the whole server down with it... But the very website is still running version 2 of this extension, with no further problems. Just reports of failed hacking attacks.
I do recommend this, especially because they have a great quick and effective support. Don't worry if you can't install the program, they REALLY help.