There’s already plenty of threads that have discussed the X-arcade, just use Google the next time you want a simple question answered.
For the price, you’d expect a stick that uses actual arcade parts, but it uses American style knockoffs. It is however very easy to mod with Happ/IL parts. It’s only worth it if you can find it used for very cheap and you absolutely prefer American style parts over Japanese.
Then there’s the input lag people have noticed when using adapters on consoles. Reps from X-gaming have shown up in these threads discussing the X-arcade sticks to try and reassure people that their current adapters are lag-free.
Now I actually have an old X-arcade Dual stick given to me by a friend with PS2 and PS2->PS3 adapters that I later bought for it, and I can tell you that I haven’t noticed any input lag, so X-gaming may have resolved the issue.