A quick community service announcement: Earlier this year I got contacted by a Chinese company called Ovartech, whose website lists a range of chargers and DC/DC converters for electric vehicles. I couldn't find any independent reviews of the company or their products on Google, but thought I'd risk it and ordered a sample of their 1kW DC/DC for evaluation.
I placed the order on 31st January, paid for it on 2nd February, and as of 31st March am yet to receive it. So I would advise against ordering from this company until we have more evidence of their legitimacy. Hopefully this forum page will show up if anyone else out there finds themselves looking for information on this company before committing to an order.
If I do eventually receive the order, I will be sure to update this thread and provide an honest product review.