Hi ! We worked in Vtiger CRM and also very much efficient in any types of CRM. I will be happy to answer any questions you might have.
This is the vtiger customization related project we have done which was awarded through freelancer. So if you look at the project description and scope, it would give you an idea of the work we had to do for this project. https://www.freelancer.com/projects/PHP-Web-Search/Fix-VTiger-CRM-Link-Website.html
We got a 5/5 review from the client which you would be able to see here:
https://www.freelancer.com/u/phpdevindia.html
Please look for the feedback provided by Liz Parker for this project: Fix VTiger CRM and Link to Website Search If you have any other questions, please do let me know.
Look forward to discuss further,
Regards,
Prasun