Pros : Once you get the hang of it, you can make some really lovely ornaments this way. I gave several away as gifts and even the imperfect ("artfully free form") shapes were well received. This is a nice basic kit so you can tell if you are patient enough to try more or not! I was hooked pretty fast and bought additional frit and glaskolben within days.
Cons : If given as a gift, remember the user needs several other things - a torch, fuel, safety glasses and a means to anneal (can be warmed vermiculite). A warning, unless you have experience, many or most may break or be disappointing. A dozen went pretty quickly while learning. Glass blowers make this look easy - it isn't, but it is fun!
I did explode a couple. Never do this without safety glasses as minimum equipment.
I received this as a gift and it wasn't complete (didn't have the millefiori). Usually I am very happy with Delphi so I think this was a fluke.
Other Thoughts : An add on to the kit, which includes a torch and safety glasses would be welcome. Instructions could be a bit better, and maybe add a video.