||VideosZ is a decent "mega DVD site". It is quite similar to VideoBox and much of my review of that site applies here, however there are some differences and overall I preferred VideosZ.
The first thing about VideosZ which I liked was how transparent it is about its content. As a non-member you get to use essentially the same UI that members do to search for content on the site. You can also see what the updates are for the day and what they will be on each day for the next week. In comparison, VideoBox hides all of this and makes its content and UI a mystery to potential members.
The site is fairly well organized and its pretty easy to find what you are looking for by studio, model, or tag. I do think they could use more tags to better help people find videos of particular types but at least its usable, accurate, and looks nice.
Downloading is similar to VideoBox in that it is awesome. Fast speeds, a 24hr login, and no expiring links.
VideosZ and VideoBox have a lot of overlapping content but there's enough differences on each site that you'd likely have a hard time choosing one library over another. Off the top of my head I believe Max Hardcore, White Ghetto, Smash Pictures, & Harmony Films were on VideosZ but not VideoBox. But they each have a bunch of videos the other does not.
VideosZ is missing a couple features VideoBox has such as being able to create custom clips or being able to scrub a video thumbnail to view it and choose a playing position. In contrast VideosZ navigation is overall nicer looking and the movie/model info much more accurate.
The most important things for me in a site are content, video quality, and value in that order. And while VideosZ (and VideoBox) do have good content, and arguably very good value, I feel that the video quality of both sites is significantly below where it should be for a pay site.
VideosZ videos come in 3 formats: avi 480p or less ~2200kbps, mp4 540p ~2800kbps, and HD mp4 720p ~5500kbps. Slightly under 10% of the DVDs are available in HD.
Unfortunately, those video specs are not really telling. For example it's possible to get a 720p video that looks pretty bad or one that looks pretty good and both have the exact same encoding specs. I assume the source videos vary wildly in quality.
I could be wrong, but it seemed like VideosZ had more "HD" content than VideoBox and their 720p videos are a slightly higher bit rate than VideoBox which was a bit below 4000kps. However every VideosZ video has a "www.VideosZ.com" water mark on it. I don't really mind this when the watermark is from the original studio, but I disliked seeing the VideosZ watermark on the video, sometimes leading to 2 watermarks, theirs and the original studio's.
It's also worth noting that VideosZ offers those who have been members for 3+ months access to additional videos from Vivid, Club Jenna, and their Hentai section. I have not tried any of that out though.
VideosZ is currently 17.95 thru PU/TBP compared to 12.00 for VideoBox. If you are not concerned with video quality, then both sites are very good. If video quality is important to you then their value diminishes a lot unless you are looking for an old video you don't expect good quality from.