You mentioned in bold you were interested in any other systems out there. I have a background in fiber optics that goes back almost two decades now. I've worked in fiber applications for broadcast, government, cellular, and military applications.
The biggest issue with RF over fiber for people that are not familiar with fiber is the noise. RF over fiber will always have a high noise floor due to noise introduced by the lasers. This is a problem with physics, not a particular manufacturer. The typical solution to dealing with this is to had higher gain to the front end via an LNA, and then attenuate back down after optical transport if needed. This maximizes the SNR as much as possible. There are two types of RF over fiber systems - direct modulation and external modulation. With direct modulation, an incoming RF signal is used to directly drive the bias circuit of a laser diode and the signal is amplitude modulated on the optical output. External modulation systems use a crystal that varies in it's opacity based on a voltage. A constant output laser is shined through this device, and the incoming signal AM modulates the output by varying how much light can pass through the crystal.
I see a lot of wireless microphone applications for RFoF where a bunch of remote antennas get positioned around a venue, and all the fibers lead back to a central location. Most applications this is one directional, with only optical transmitters being used by the antennas. I have personally worked on a lot of these systems for large theme parks. These wireless mike Distributed Antenna Systems (DAS) are becoming more and more popular. In the cellular markets fiber DAS systems are getting more and more common. I worked on a large downtown distribution for the largest city in Arizona, and all of their cellular radios for several city blocks are now co-located in a single room. This allows easier management because cellular operators only have to access one secured location.
I've worked with several equipment manufacturers throughout the years. You don't always get what you pay for. A lot of companies will outsource their production and manufacturing, and are doing little more than slapping a new sticker on OEM manufactured gear from China. I've never personally handled the Wisycom equipment, but it looks nice. Seems like they have some good RF engineering support. I have handled RFVenue gear, and it's reasonably made for the price. Some of the other gear I've handled includes equipment from Optical Zonu, Thor Fiber, Vialite, RF Optic, Foxcomm - and probably several more I am forgetting. Optical Zonu is the company that I have the most familiarity with (
www.opticalzonu.com). I have been to their production facility in Los Angeles, and their RF engineering team was incredibly helpful in several different projects I worked on. Since they manufacture here in the states, they are able to modify existing COTS equipment for individual applications where the requirements might vary. They have some solutions that don't exist anywhere else, like Iridium Satellite Phone over fiber systems, and DirecTV over fiber. Zonu is who I reach out to when I have an application that hasn't been done before.
RF over fiber is a complicated discipline that requires expertise in both fiber optics and RF to be implemented successfully. The primary benefit is the low attenuation over fiber cable vs coax. This loss is literally measured in fractions of a dB per kilometer. Its that low. If you need to transport RF over fiber you need to find a partner that knows what they are doing. Most of the time it can be done well, but a lot of different parameters need to be taken into account. I've gone on for too long now, if anyone has any questions let me know.