This is without a doubt the best $2-odd I have spent in a while. The Wing Sung 3008 is a genuine piston filler fountain pen, meaning that there is no cartridge or converter, the barrel of the pen holds the ink. I can get about six weeks worth of writing out of one refill.
These were about $4 USD until recently. Now Aliexpress is selling them for $1.50 USD. I find it honestly incredible that you can buy a piston filler pen for the same price as a Bic Crystal. Normally you would pay around $150.00 for a piston filler from the "traditional" brands like Lamy or Pelikan etc.
Its an extra fine nib. Normally not my style but I like how I dont have to worry about it bleeding through the paper. Its not a great nib, however its Lamy compatible so you can always swap it out for another. Some people complain about it but I have had no issues with it. No skipping, scratching or hard starts. To be honest it performs better than a lot of brand name pens that I have.
What colours did you choose? Gold would look lovely on my chequebook;-)