The 4130 comes with connection options for everything from composite to HDMI, along with a 10/100 ethernet port. It is possible to wirelessly enable the 4130SH via one of the unit's two host USB ports, although you'll need to check DVICO's Web site to ensure you're using a compatible model.
The 4130SH's file support is, in a word, excellent. If there's a digital file format you're interested in, chances are the 4130SH supports it straight out of the box. To give you a idea, the list of currently supported video formats includes avi, .wmv, .mpg, .iso .vob, .ifo, .mp4, .asf, .tp, .trp, .ts, .m2ts, and .mov(H.264). Codec support includes wmv and DivX, along with some slightly more esoteric (but still useful) formats such as MKV, FLAC and OGG.
The 4130SH might not look a whole lot like its more expensive brother, but it certainly behaves in a virtually identical fashion. This is an approach that has its ups and downs. We certainly loved the quality of video playback (1080p video is supported, as long as your display will cope), and the huge range of file formats that the 4130 will run is great if you're a video download junkie. The unit's small size makes it easy to incorporate into most home A/V setups, while also making it somewhat portable.
On the minus side, the manual is a mess, and does a very poor job of explaining how to network the 4130SH properly. We knew what we were doing, and still had to fiddle around with poorly labelled controls to get the 4130SH onto our network properly. Even once that's done you're solidly limited by the fact that the 4130SH will search out only one specifically named folder on your PC to stream from; many other players are able to search throughout a PC or NAS drive folder structure.
Ultimately the 4130SH is a cheaper alternative to the 5130SH, but most of the same caveats apply. It's a good player if you're after lots of file compatibility and don't mind quite a bit of tinkering -- including installing the hard drive yourself, and making your way through the rather Byzantine maze that is properly networking the unit.