When I was running Anwida DX Reverb Light on a Hewlett Packard Pavilion dv8000 lap top with a 3.0 Ghz processor and 2 GB of RAM, before I switched over to Pro Tools. This plug-in can only be run on a PC, so I no longer have this plug-in on my Mac. I had this plug-in for about a year before I switched over, and it was definitely a good enough plug-in to warrant having around. It takes up an extremely small amount of processing power, so I would think that as long as you're able to run your DAW with plug-ins smoothly as is, you'll be okay with this one.
Anwida DX Reverb Light is definitely a plug-in I'd recommend checking out if you have a PC and either a VST or Direct X supported DAW. It isn't going to break down any boarders or give you something spectacular, but for the light version of a plug-in it actually has a good amount to offer it's users. The sounds are useful for mixing smaller budgeted or home studio projects for sure. I'll always recommend at least trying out a free plug-in if you're able to, but with DX Reverb Light I really don't see a reason not to have it in your suite full time.