Kd Hdmi-4x1
I have one of these devices. I use it in conjunction with my JVC RS1 and Prismasonic R1500FE lens.
It works admirably and I'm very happy with the core image quality, it's scaling capabilities, and its price range.
Strengths include the ability to output 1080p from other sources such as 1080i and a nice selection of test images and setup options. I have found that the "stretched" images look great when outputted through to my projector.
It does have a few weaknesses, however.
a) It's not really supported by Key Digital any longer. I had an IR receiver (the front one; it has one in the back as well!) go bad on me and The Folks At Digital Connection fixed it under warranty. I'm not sure how that cooperation works between these companies, but for me it worked out well when something (simple?) went wrong. At a minimum, it's safe to say that the people at Digital Connection have some good technical staff working for them.
b) It doesn't process 24hz, only 60hz and a few older frame rates that (for example) were common in the UK. (I don't recall exactly what it supports.) This makes sense given when it was created and what it's original purpose was. (It was designed with flat screen TVs in mind when they created the scaling features; the manual refers to preventing burn-in!) So, expect to lose your glorious blu-ray 24 frames per second... I miss that; it's the biggest downfall of this device, but to be expected given it's price range.
c) There are no discrete IR codes for going to a specific zoom setting. If you want to stretch the image, you have to 'scroll' through the various options. This means I can't set up a single button on my universal remote to stretch the image.
d) Watch the connections... it takes optical audio in, but I don't recall that it switches coaxial. If I recall, I bypass this switcher for some audio outputs that aren't optical. I don't have a receiver that accepts audio through HDMI, so I can't speak to how well it handles audio. For video, it switches flawlessly.
e) It's LED panel in front is annoying in its brightness. Even in "Standby" mode, it has the words "Standby" lighting up my bat cave.
Some of those weaknesses are nitpicks. For the price, I believe this device is a wonderful solution to a lot of our issues. Just keep in mind, you're buying "older" tech.
If you have any specific questions, feel free to post.