I don't know how good Makerbots glow in the dark filament is but I can guarantee that glow bug yellow from Faberdashery is excellent. I also tried the one from Reprap world, it glows nicely but during daylight it is dull grey color which makes it a bit unattractive. It is also more brittle than the glow bug yellow which by the way has friendly light yellow to green color during daylight.
Glow bug is more expensive though. You can get 100m (880g) for 31£.

Glow bug (Faberdashery);
http://www.faberdashery.co.uk/produc...lowbug-yellow/

Glow in the dark (Reprap world);
http://reprapworld.com/?products_det...1590_1619_1640
*21% VAT not included in the price

- Filip