Well, I do. I was one of the people who bought into the Motorola Atrix and its Lapdock... the latter I still have sitting around here and I'll probably hook up a Raspberry Pi to it soon so I can put it to use.
What I don't get with this these days is why. What's the use case? Let's review why you might want this;
* Having all your data in one place and up-to-date: Hasn't "cloud" stored documents kind of made this irrelevant? I have two cellphones (one for work, one personal... it's a choice thing) and I already have the ability to edit files on my desktop, laptop or tablet and then open or even edit them on my phone. Yeah, there are the odd occasions when a sync takes longer than anticipated but it's rarely more than a few seconds... and I can force a sync.
* Convenience: Nope; if I'm carrying around a clamshell dock then why not carry around a small laptop or a tablet? I use a Dell Venue 11 Pro as my secondary device on the road (with both keyboards for different use cases) and I can pull up any document or note that I have taken on my phone easily. Between DropBox (not used much any more), OwnCloud (primary) and OneDrive I think I'm pretty much covered. In fact I rarely use the commercial solutions these days except OneNote... which is also available on all the phones.
* "Cool Factor": No. Again, I don't see that people are really going to get it. The use cases just aren't there.
Besides there are lots of downsides. Security is a joke in the mobile space, storage and RAM are still small and slow because of the power budgets required for it, and the CPU performance just isn't there... again because of power budgets. Yeah, I can plug my phone into a dock and surf the web or launch Citrix apps... but then why bother? Why not do the same with my full-featured tablet that won't take a shit on a complex web page? And if I need online then I am rarely far away from a WiFi access point in most cities, and when I am not then I can just use my phone as a tether.
You might say I'm not the target market... but I'd say I am exactly the target market. I loved that Atrix and lapdock because at the time they really did fulfill a need that was important; documents and usable applications on-the-go. But the simple fact is that other technologies have really bypassed this concept and made it irrelevant. On my desktop in front of me I have three computers... one Linux and two Windows. Three screens, but only one set of keyboard and mouse... I use Synergy (https://symless.com/synergy) to tie them together for workflow and OwnCloud (https://owncloud.org) to my ZFS-based server at home on all three of them so the same documents are available on all three. I can edit a document on my desktop (primary when I'm at home) and the files are on my laptop and Linux box in seconds. When I'm on the road I can use my laptop to edit these documents (and yes, my OwnCloud is available outside my home as well) and then in a meeting with a client I can pull up most of those documents on my phone for reference if I need to. I say most because simply put the phone is not powerful enough or does not have the application support to open up really complex docs. But that's fine, because if I need more complex there's the laptop or the tablet to pull these documents up.
And the thing is, none of this is that complex. The average person could do the exact same thing with DropBox or OneDrive... no problems. I just happen to use OwnCloud because (a) I'm a geek, (b) I can and (c) I like control of my data. But that's just me. Between OneNote, EverNote, DropBox, OneDrive etc. etc. etc. there's no reason that you need some kludgy Lapdock to actually get any real work done.
Bonus; due to OwnCloud I get multiple backups. Even if my house burned down then statistically one of my devices with my data on it will have been with me... and if not then I have it all backed up to Amazon Glacier anyway... so while slow it CAN all be restored.
I would say the ONLY use-case I see for this is someone who maybe only has enough money for one real device; a phone. A lot of teenagers these days in particular only have the one device. But Samsung will do the same shit Motorola did; price this thing so high that you can buy a pretty decent consumer-grade laptop that can do more for the same price... or even a Chromebook will take care of 99% of most people's needs that this will do. If Samsung sells this for like $99 as an accessory then yeah I can see some people getting it... but much more than that and people will just walk away.
Again... can someone convince me why this is a workable solution for people when other, better and more mature solutions exist?