Here is my vanity address with my username
1A7mosMtabZcDFdfUaEge3bYzmAfCqzXEf
I wouldn't personally trust these Vanitygen generators, especially not the online generators.
I have a bitcoin address which i generated from random which starts with 1Body
No one should trust these sites that create vanity addresses as they can store the private keys and steal all funds that come to the address.
But vanitygen generator is trustworthy as long as you use it on a clean and offline PC