<< 
The main problem with Soltek in the US has not really been their product offering. Rather, it has been due to their distribution. Soltek does not have their direct representation in the US. Instead, they use a distributor, A&M DISTRIBUTING, which, in my opinion, has not been doing that good job marketing their product.  For example, the distributor is selling the products directly through their website, www.soltek-usa.com, instead of more actively promoting them to be sold through more main stream distribution channels. In fact, dispite its name, the web address, www.soltek-usa.com, is with the distributor. >>
Actually, 
www.soltek-usa.com is Soltek's designated US portal, though you are correct that Soltek still has no "official" (company owned) office or operations here in the United States.  It is all handled by MISR Corp. (the retail end of A&M Distributing) or Softek Distribution, though Softek Distribution has been in operation longer at 
www.soltekusa.com.  I've purchased directly from Softek Distribution a few times via Tom Keels, they ship from Escanaba, Michigan (though the company is based in South Carolina).
I'm not sure if A&M and Softek are essentially the same company, but the e-commerce areas of their websites have the same look and feel.  The WHOIS registration info for the websites gave the following:
Domain Name: SOLTEK-USA.COM (aka 
www.misrcorps.com)
Registrant:  Misr Corp
Jensen Beach, Fl 34958
Created on: 22-OCT-01
      
Administrative Contact:
Metwally, Amr  
metto@misrcorps.com
Domain Name: SOLTEKUSA.COM
Registrant: T.N. Keels
Columbia, SC 29202-7006
Administrative Contact, Technical Contact, Billing Contact:
Keels, Tom
SOFTEK, Inc.
Columbia, SC  29202-7305
Record created on 22-Jan-2000.
I'm not sure how all these companies are related, precisely.  MISR Corps, and probably A&M Distributing, is an Egyptian startup.  There is an MISR everything: MISR Bank, MISR Travel, MISR Network, MISR Medical, and they're all Egyptian companies.
Soltek has had several noteworthy boards and has been praised by Tom's Hardware more than once in the past two years.  They just do not have any presence here in the U.S., but they're a rising star in Europe.  I've used several of their boards and have been satisfied with everything, except that they unexpectedly discontinued a couple models that I purchased and their technical support pages are very inadequate for all but a few of their best-selling boards.
The SL-63AV+ was described as having adjustable core voltage, but when I purchased four of these boards, they came with no such feature.  Soltek's explanation was that it was "manufacturing option", though it was NOT described as an "option" at the time I purchased.  Turns out, this "option" never saw production.  I was a bit miffed by that, but the board was very solid for AT upgrades and worked flawlessly (up to PIII 733MHz).