Sadly, Lava Lite's quality fell drastically around 2003 when they outsourced the making of their lava lamps to China. Even some 2002 lamps have quality issues. The flow, clarity and quality of bases has suffered to the point that many serious collectors will not purchase the lamps. However, non-collectors will buy them and this appears to be what keeps Lava Lite afloat.
To date, efforts have been made to improve quality, but with limited success. The manufacturing plants in China have made things difficult with unauthorized formula changes. But as as May 2012, Lava Lite has announced that they plan on returning manufacturing back to the USA in 2013.