Yea, the cost isn't THT bad... The only thing I'd say though is to BE CAREFUL WITH THAT CAPACITOR... it's there to help you, but it can really scr*w you big time if you mess up.
Just trying to get it instilled in your mind, so you learn the easy way rather than the hard way (by hard way I mean I broke probably 7 or 8 Blu-ray diodes because of it). Basically, make sure everything is correctly soldered BEFORE you ever power it on. If you do power it on, and you forgot to solder something... disconnect the battery, and SHORT OUT THE CAPACITOR (you just touch the leads of the capacitor together, such as with a wire or something). Then solder anything which isn't done, and reconnect power.
Sorry for the CAPS, I just don't want you to be sad like I first was... It took me like 8 diodes before I got a nice, working laser (mostly because of bad soldering - I blame the wire, it wasn't copper... I think it was practically aluminum or something).
And not to drag on or anything, but it looks like it didn't come with a diode (not Laser diode, I mean regular diode), it protects against reverse voltage. Really, you don't need it, so long as you make sure you connect the positives and negatives correctly. If you mess up, the diode will also break.
Well, good luck
and welcome to the forum, you're gonna love it hear. Sorry if I scared you lol
Edit: okay, I kind of see now that he basically said the SAME thing in his description^^. Well, I guess it can't hurt to warn twice
2nd edit: Ohh yeah, almost forgot to warn you like every new laser enthusiast... you should get a pair of protection goggles, especially if you plan on burning things/shining it around the house a lot. Certified goggles can be found
here, but cheap goggles can be found
here (I personally recommend them, but there is plenty of controversy), OR if you are REALLY too lazy... at LEAST wear a good pair of sunglasses (some sunglasses block UV light rather well, others are horrible - check first on the side/edges of the glasses).