Half a gram for $40 kinda stings especially for pure gold. Pure gold is generally crap. Their advertised test results are based on their old processing methods, they aren't current. It's basically false advertising. When tested independantly they are total shit.
Here's a tested pure gold capsule.
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http://www.sclabs.com/index.php?option=com_scl_tested&task=sample&Itemid=359&sample=120706J013
26% lol
Far different than the 90% they claim. $40 is a lot of money to pay to vap half a gram of hash oil mixed with glycerin.
I'd instead go with a reusable wax pen. The new generations of micro pens are really great.
The micro G-pen, the mini clouds, dabr, eclipse mini, etc. These are all the same pens produced in the same factory, the only difference is slightly different cartridges which are interchangeable between brands. I prefer the cartridge on the DabR pen just because they last a long time and are harder to break. The micro vap pens at ruvaped.com (micro vaped) are probably the most popular right now due to their different cartridge options. The cool thing about them is that they make a globe and nail attachment which I've heard really good things about. They don't sell the dome seperately on their website but I've seen them sold separately in stores. If I had to get another, I'd probably get that. Although I would not get rid of my DabR pen for anything.
Here's the micro vaped dome set (can also use their normal cartridges, not necessarily interchangeable with other brands)
http://www.ruvaped.com/shop/micro-vaped-glass-globe-edition/
Here's the DabR pen which I have and highly recommend (interchangeable cartridges w/ micro g, cloud, eclipse, etc)
http://shop.dabrusa.com/The-DabR-DABR.htm
It's definitely worth getting one of these over the pre-filled. With the pre-filled pens you're going to pay $40 each time and you're only getting half a gram. Even worse, those half grams are mixed with 50% glycerin, so you're really getting 1/4 gram of usually the lowest quality oil you can get. The oil used to fill these pens comes from oil that is so shitty dispensaries can't even sell it, so they sell it to the people who fill these pens for $5-7 a gram. It's the worst of the worst.
So basically when getting one of these, you're paying $40 for 1/4 gram (because it's half glycerin mixed in) of the lowest quality oil available. If you get one of these wax pens, you buy the pen once, then you can fill it with A grade wax for $40 for a full gram, or you can buy lower grade but at a discounted price. You'll be money ahead by the time you buy your 3rd gram, and you'll be getting better product.