They're fine. Sometimes you get a lemon.
Many people are fine using them. Others will swear against them. They are pretty much compatible with upgrades.
Its your choice.
Next time though, you should research the brand and gun via the forums, or google.
Edit: damnit. lemega posted seconds before me, haha
For anyone looking for age verification in the Windsor region: Unfortunately, I will only be verifying people at games, I am currently unable to run around and setup meetings.