Contrary to previous feedback left here I must add that I have totally different case and got only positive experience after successfully working with these guys. I also had a Shopify projects too and came to xhtmlfactory after googling over the web, comparing prices and online reviews for various PSD to Shopify integration services.
After conducting my own exploration I realized that mostly two types of such services are exists - Indian guys who're lying in over 95% cases and good yet pricey services like PSD2HTML. Xhtmlfactory became for me a good median in terms of price and quality and I decided to gave them a chance. Yes, I saw quite a lot of positive reviews and couple negative ones, which I found not quite adequate or simply duplicated through a web. But in any case I felt quite safe being protected by paypal moneyback policy.
Xhtmlfactory did two PSD to Shopfy conversion projects for me to date. One is my own project and one is template for template marketplace (themeforest). And in both cases I had absolutely smooth process and timely delivery. I'm really, really happy with our collaboration.
However I'd like to say thank you to Ben L. For sharing his negative experience and even launching dedicated site for your story, which I have read completely. I'm pretty sure that such negative feedback forces vendors to improve their quality of customer service.
Thanks to guys from xhtmlfactory and wish you luck with your future and current customers