My youngest did one (with my teenage son as his +1) and my daughter put together mine (with me as the +1). It was definitely worth it. I want my teenage son to build one for himself and let DH be his +1 so that DH can experience it too. (Teenage son said he wasn't interested or I would've booked a spot for him too.)
My daughter has an Anakin saber she bought at Dok Ondars. She also has a saber she bought online. She didn't want to get the Savii's lightsaber, so I had her build mine so I could take pictures. Now, I think she wants her own.