I think the user interface here is ok but I wouldn't say it's the best I've ever seen by any stretch of the imagination. It works just about well enough, however, to be helpful rather than a hindrance with a couple of reasonably well organised indexes. There wasn't any clear update information and it doesn't go out of its way to make it easier to find similar sets or anything like that, but it does a reasonable enough job.
There were enough video viewing options here for you to make use of with streaming and downloading both covered. The download speeds here were very good, by the way. They are probably aided by the fact that there are no HD videos here, but even so I still thought they were quite swift. The image sets here are all available for ZIP download and the image quality was generally quite decent for this kind of site.
Spy Archive.com is quite insistent that there is "no staged stuff" and that you are seeing "100% real voyeur action". As cynical as I am about porn site claims like this about 99% of the time, I can report that they seem to live up to their promises to a certain extent here. None of the content looked at all staged - whether or not it's all real voyeur action is more difficult to ascertain though, obviously.
It doesn't matter all that much though because it's such a vast archive of galleries and videos that the chances of you not appreciating a lot of it are very slim indeed. The mound of content you get here is growing at a rapid rate as well, meaning there is always some voyeuristic naughtiness to feast your eyes on anew. Well worth a visit if this is your thing.
Amount of content: 2,500+ videos and 1,200+ photo sets
Update frequency: Numerous updates per week - set schedule in place
Exclusive content: Yes
Max video resolution: 720x480px
Video types: Flash and MP4 (stream and download)
Photo resolution: 1000x750px
Available for mobile: No