I am using the DR-MX1S to dub VHS to DVD. I also have a JVC HR-S9600U connected to a Panasonic E-85. Both processes do a good job. For fussier tape problems I use the 9600 for the reasons Spyder gave. I also have a lot of S-VHS recordings that I will dub on the 9600. The DR-MX1s does quasi S-VHS playback only.
I bought the DR-MX1s because ecost had some refurb units for 349. A good price for a DVD recorder with a hard drive and with the VHS component thrown in, couldn't beat it. After all, it is a JVC and they make the best VHS devices. I wouldn't pay the current going price for a new unit which is about $600. The JVC MSRP is 999.00.
The best thing about the JVC is that you can tell it to dub a whole 6 hour tape and it will create separate titles each time it detects a VHS index mark. For example, I recorded This Old House epsiodes in EP mode on tape resulting in 12 shows per tape. I set up the dub process in the morning and come home at night and have 12 titles on the hard drive. I could do this on the Panny but I would have to search and separate the individual titles.
I do not like JVC interface compared the Panasonic interface. In the Panny you select a title and then bring up a sub-menu to decide what to do with it, edit, rename, delete, etc. The JVC works in reverse. You decide a process and then pull up the titles to apply the process.
The JVC has a much better implementation of flexible recording than the Panny.
The biggest flaw with the JVC is that you can not high speed dub an edited or divided title to DVD-R. You can HS dub to RAM or to -RW in VR mode. This is not a major problem for me as I do my editing and authoring on a PC but this could be major for someone who wants to finalize on the JVC. It is in the manual that this is the case and I verified it myself.