I don't believe they have anything against Chinese people (CNS), it was a simple misunderstanding.
Ehhhh I disagree but hey, what do I know.
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CNServers is cheap, west coast only. Nullroutes are undocumented and your details are apparently not private.
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Staminus is in 3 locations and provides good filtering levels over GRE + BGP. Support is some of the best with 95%+ of our tickets being answered within 5 minutes and resolution well under 10 minutes. Great control panel, tons of logging. API is OK, though I don't like how authentication is handled.
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Voxility provides very high filtering levels. API is very basic but supposedly a new revision is due soon that improves it a lot. Pricing is very high but expected given protection levels. Their billing & sales teams are fantastic to work with and their support is very knowledgeable and quick to reply. All communication is handled via email.
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Blacklotus provides filtering and allows you to scale up fairly high last I heard. Their filtering used to be pretty terrible allowing tons of floods to bleed through. They've replaced their entire platform with an Arbor platform, though I've not heard any reviews about them past what Clamhost has mentioned to me.
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Colocrossing has filtering onsite in their Buffalo location at high levels. OK priced on full server protection though Jon is a pretty aggressive salesman so you can likely catch him in a good mood/etc and get a better deal. I don't know anyone that has used their filtering though RioRey's have limited PPS protection (30M pps max on their top units). TCP SYN/Layer 7 filtering seems hit/miss given they had to pull lowendtalk behind not only a synproxy (we all saw that pfsense box) but also cloudflare.
They haven't been dropped offline yet so it's likely pretty decent. I haven't used their filtering before so this is just based off my research into RioRey's.
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OVH includes filtering in all servers on their 'OVH' lineup (not the soyoustart lineup). Filtering levels are high, usually 50 - 60gbit before you're getting a null. Filtering seems to be fairly ACL heavy given some of the floods they leak. TCP filtering is hit/miss from what I've heard.
I have no direct experience, I'm simply going off what we hear from customers on our Minerack brand.
From my own experiences, Staminus provides the best hands-on experience when it came to filtering. Their support really went the distance to explain things to me, but also respected our staff enough to not patronize us when we got into technical discussions about custom filtering.
Francisco