I decided to get the LightBlaster because it was better designed than my DIY attempt. My DIY version was so finicky that I only used it on a paid shoot once. This is a much more reliable product.
The device came with 2 slides - one random slide (a snapshot of someone's birthday party, maybe?) and a slide with 1's and 0's. Unfortunately, the 1's and 0's slide has the text in black with a transparent background - I wish it was reversed to mimic the DIY slide I had created. I may have to dig those out.
I bought the Creative Backdrops Kit and the Special Effects Kit with my LightBlaster. That means I have about total 45 slides. I haven't tried adapting the slides I had made for my DIY rig. Maybe I'll try that soon.
The dragon slide I used came like that - it was already yellow. You can use a gelled flash with the LightBlaster, but most of the pre printed slides are color positive transparencies - meaning they look just like a photograph, just transparent.