I'll try to help out with a few things here.
From what I remember reading on previous posts, the Hypersonic Centrino model has a different ODM and is not a Clevo model? Remembering further , someone said it was made by Compal , who also makes some of the Dell laptops.
As far as 30 days yes that is confirmed after I did a bit of digging. Here is the exact policy.
30-Day Money Back Guarantee
All Hypersonic systems come with a 30-Day complete satisfaction guarantee. If you are not 100% satisfied with the your system you will have a 30-Day period beginning from the date of shipment from Hypersonic PC in which you can return your system. You will be responsible for shipping back all returned items to Hypersonic PC within 10 days of the return authorization date. A refund will be issued in the exact manner by which you paid minus all shipping costs, any missing items and a restocking fee up to 15% (dependant upon many factors including the state of the returned system, the included documentation and software). Any opened software purchased with the system is non-refundable.
As far as commenting on their tech support I would not be able to offer a personal opinion here. But check outReseller Ratings
and type in Hypersonic . It looks like alot of people seem to think positive of their sales and tech support teams. You can't really beat PCTORQUE or Adam/staff for their level of support extends far beyond what any other company would do for you. Unfortunately they don't offer that Centrino laptop.
I was curious. As far as negativity associated with the D800, what exactly are you refering to ? I haven't heard alot of gripes with this system except maybe for it's standard physical design isn't really eye catching.
I'd have to agree with your decision to stay away from the Sony model. You are getting good options for your money with practically anybody else and better quality components.
If anything, you can return the laptop if it doesn't meet your expectations. Remember!!!!!!! Try and keep all the plastics/manuals etc in factory condition just in case you have to do so. You can actually avoid the 15 percent restocking fee as long as you don't tear up everything and give it back to them in crap condition. You will have to eat the shipping costs though, and I recommend insurance/delivery confirmation even though it is more expensive just to be extra safe. I say that is a price to pay to be able to test out the waters for yourself so you can personally comment on what you like/vs dislike.
Also, if you could and manage to ultimately stick with the Hypersonic Centrino model, please do a review or synopsis of what you liked/disliked maybe even some performance analysis since I think you will be the only person or first person to get the Hypersonic Centrino laptop on these forums.