@zipcode I can't speak for Rimon.
As far as Netfree goes:
Netfree is whitelist based.
I'm a webmaster for several websites and I need to be able to access/administer them through the browser and through ftp.
Shouldn't be a problem but requires a request to whitelist them if they have not yet been whitelisted.
I'm a graphic artist and at times I'll need access to stock photo websites. The problem in this case is these websites seem to randomly toss in unexpected photos that I deem not-tznius.
At times I will need to search through many screens of photos to find the best image.
As far as kashrus is concerned Netfree is absolutely without doubt the best, each image passes a human inspection. Only images with no women are allowed through.
On the practicality side of things: Be prepared to sacrifice for the sake of kashrus...
The fact that ALL images must undergo human inspection means it takes time for images to come through. (Any previously checked image will not undergo another check so on very popular sites most images will be available immmediately.)
Any images containing women are blocked even if you might deem them ok.
I need access to Gmail, Wix, Google fonts, and a few other sites to download shiurim.
Should all be ok. (As long as the shiurim follow the mainstream charedi outlook).
How is Rimon filtering different for this use case?
Reportedly they cannot filter images very well. Some sites will have even kosher images blocked and other sites will have even unkosher pictures available.
Reportedly the customer service is far less good.
Obviously you can't expect a totally unbiased opinion in the Netfree forum...
A huge difference is that Rimon is a business venture targeting mainly the dati croud whereas Netfree is a charedi non profit venture.