It is safe. R18.com is the REAL English site for DMM. I have an account with them and have bought videos from them before. I have bought around 15 videos from them already. A few of them, I bought when they are on sale.
But I do advice you to get the videos when it is on sale. As some videos are quite expensive. I learn that a hard way when a video I bought become on sale 2 months later which could save me 15 bucks. But of course there is no way - I think, to know when your video is going to be on sale though.
Another advice is, if your video is a recent release, it will be very expensive. Most likely price at 30USD range. If you really want that video, wait for at least 4 months - estimated range, after date of release, and the price will drop a lot. A few videos I track on my wish list happen like this. But I not sure if it applies to all recent release though.
Last advice is, when you bought the video, in which you choose both streaming and download, your download you can only play in Windows Media Player. Other players can't play them. Even VLC can't. So you may want to take note of that.
Hope this helps!
