Wow. I totally forgot this thread existed! Time to contribute!!!
First off...That's the one I used!
In terms of thickness, I'd say it's very good as far as wigs go. At least compared to others I've worked with. Wigs in general are never very thick. Example, if you put a tie around one wig, the ponytail would be thicker than the average persons. Because the colour is actually a bit of a mixed tone, I don't think it will be easy to find extensions that match ONLINE...but if they're in the middle or underneath close-enough will be fine.
Now, a few points...
1. If you're planning on wearing it loose, one will be fine. Especially on a budget. But if you're wearing it out for Halloween, it's going to tangle and need high maintenance. If you're planning on putting it into a braid, you'll need at LEAST 4 for an accurate one. 2 wigs will probably give you a braid about 3 inches wide. I used foam tubes for my base and still needed FOUR wigs to properly cover them. Too bad, since I was planning on still having one loose to wear down.
2. It does not look the colour on screen. It's much more or a natural blonde in person. In some light's it photographs a bit darker than I would like, but usually with flash it has a beautiful golden blonde to it.
3. It does tangle something fierce!!! It was ALMOST hell to separate the sections to wrap and braid etc etc etc. I had to dig up a LOT of patience. Even if you're leaving it long and straight, you'll find the same thing when you try to separate the wefts from one wig and separate them in the base to sew the additional wefts in. Though I found the easiest way to cut the one wig apart was to lay it flat, fresh out of the bag, wig cap laying down ( so, the netting part that goes on your head facing up ) and cut from the bottom wefts up, lifting them off the base wig 1 by 1 as you go.
4. If you're doing the braid, you will need a lot more than 2 wigs.
One wig worn down with flash:
Looks more dark gold here:
Four wigs, 3 foam tubes, a can of hairspray and an eternity of patience later:
Good luck! If you have any other questions, let me know.