That's a BAD idea 
I'd look strictly @ VMware VSA on your place. And here's why. When it comes to storage there are few things you need to take a look at initially. So, one-by-one:
1) Support. VMware VSA is coming directly from a hypervisor vendor. It's a) supported exceptionally well by VMware staff b) quite popular among the community c) certified and d) allows to avoid fingerpointing phase
as all the components are coming from the single vendor. When you look at the stuff that guy had pointed at you'll see it's a) badly supported (dead forum, one-man-company, mainland China so no English
and no business hours because of the time zone etc) b) has virtually zero people using it so you'll be on your own c) not certified and d) also with c) VMware will simply refuse to support you becase of the
incompatible storage. Keeping in mind a) and b) you'll be the only guy on Earth who'd care about your datastore. VMware is a definite winner here 
2) Price. $1,800 they want from you is just a part of the story. Now it comes to at least a pair for a servers (physical ones) and a pair of Windows server licenses. So you can add easily $2,000 - $4,000 to their fee. This is
more expensive then VMware VSA and VMware Essentials Plus (where you have other nice features these guys can only dream about) being both around $4,000 (or less if you have a good VAR with a good discounts).
And don't forget corresponding network infrastructure like switches, cabling, rack space etc and air conditioning, electricity and "care taking". Because of the two more physical servers you'll have to deploy! So both CapEx
and OpEx are better for VMware as well
3) Performance. With VMware VSA all VMDK I/O is local and bounded with the hypervisor node. With a network solution any I/O request will hit the wire so is SLOW. This means you'll have more of the IOPS from VMware
then from the referenced stuff. VMware wins again
At the end of the day... These guys are trying to sell you (yes, he works for that company so that's the answer WHY) something which is a) slow b) expensive and c) has no support. I would not buy it Also think about
other thing... Good vendors don't desperately try to sell their stuff to anybody because of the refunds and bad word of mouth and tons of support. So if somebody is doing this - he's running out of leads and eventually
money. How long they will stay in business? Who knows... Why do you want to buy the same infrastructure component multiple times?!? VMware from the other point of view is here for a while Buy VMware VSA and be happy!
Good luck!
P.S. I don't work for VMware, I work for a competitor. But I'm not going to sell you what my company does
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Atomliu; I'm definitely checking that one out, thanks for the tip!