Summary: I work professionally in video and motion picture production. I have about 50 S-VHS tapes from the early 90s that I needed to back up before the tapes fall apart! Very inexpensive deck(at this point), but you will need a time base corrector to stabilize the video signal if you plan to digitize to a hard drive, such as via Apple's Final Cut Pro, Sony Vegas, Adobe Premiere, etc. Otherwise, you will have video/audio dropouts.
Summary: I bought the 3911 because of the s-video input and output. The unit in theory has great features, but in practice it was disappointing. Most notably, the color switched periodically to b/w and sometimes the image was lost altogether. This could be remedied by a gentle bang on the side, although that was not listed as an option in the manual:0! I returned the unit thinking I had gotten a bad unit but the replacement was just the same.
Summary: I did a lot of online investigations and finally bought this machine. It is worth every dollar we spent for its sharp video and audio quality with two S-video outlets in the back. If you are looking for top picture quality, especially if you are using satellite dish, it will be your best bet. This model is made for those who have a high-definition TV, using S-video and other gudgets to watch recorded movies with a DVD quality.
Summary: I was looking for a VCR with S-video input and output connectors and hoping that the quality with S-VHS tapes would be a significant step up from VHS. I tried several different brands of S-VHS blank tapes ... but never got a significant improvement over VHS recordings. In some cases, especially with large areas of blue or black, random dancing pixels caused by tape noise detracted noticiably from the the video fidelity.