I haven't compared the Solux bulbs with similar products. I purchased my Solux bulbs based on information I gathered on the internet. Also, I just recently installed my Solux bulbs, and haven't done much testing yet. I'll provide my initial reaction, however.
My LaCie Electron Blue IV monitor is calibrated with an Eye One 2, and my printer has a custom profile. Before I got my Solux bulbs and used typical home lighting, my prints (and prints from a lab) looked noticably different than on my monitor. My prints viewed under Solux lighting match my monitor very closely. Also, my prints look very similar under my Solux lighting vs daylight from a nearby window.
Based on my very limited tests so far, I'm happy with my Solux lighting.