There is little doubt that this is a very low budget film. It has that "shot on a home video camera from 1989" look, and everything--the directing, acting, editing, and so on--is a bit rough around the edges. You're either familiar or not familiar with this kind of "guerilla" film-making. If you're familiar with it, you know what to expect and know whether you should avoid Butterfly Man based on your opinion of those kinds of films, which have to be watched a bit differently than the high gloss stuff. If you're not familiar with it, don't initiate yourself with this film, because this is a pretty good one, and you don't want to waste the experience on trying to acclimate yourself to the style.
The first sign of success is that to a large extent Butterfly Man feels like a transparent home movie made by Adam (Stuart Laing). The film somewhat vacillates between a rough travelogue, almost ala "Globe Trekker" (which happens to be my favorite travel series of all time), and a more normal narrative. It's an iffy mixture that ends up working quite well here. It also affords a stronger immersion in Thailand as a foreign culture, which is very important to the plot.
Because the film begins more like a travelogue with a thin dramatic overlay, it's something of a surprise as it turns into a "hell-in-a-handbasket" film with a well-constructed thriller plot. Unfortunately, this is a case where a fat budget would have helped immensely, but writer/director Kaprice Kea and crew still do a more than decent job with the resources available. The ending is also notable for being very unusual, poetic and admirable. Fans of recent microbudget indies shouldn't miss this one and everyone else should check out five or six of the crappy recent micro-budget indies before coming back to some of the good ones like this film and Milk and Honey (2003).