I have used some Keyence units, and they do what they are supposed to. I found the programming diferent from what I am used to. The only way I can describe it is that the rungs would be backwards from what you are used to. Visit their site, there sound be a couple of booklets listed that could help you.
When looking at Keyence, you will note that it looks different from most plc's. Now, when you visit the Entertron site, you will note that they look different too. One thing that I like about Entertron, is they have a lower profile againts the back of the panel, allowing for a "thinner" enclosure to be used.
I like the Entertron a lot more then the Keyence. I find the software easier to use, and as mentioned by Stephen, the outputs are a "little" more robust. And every amp helps!
Either brand should work for you, but I would recommend the Entertron.
best regards.....casey