Worldpay can be trusted.
I have used Worldpay myself and although they have some complaints they have many more good reviews than complaints.
Any company is gonna get some complaints from somebody even though they are a trusting company and worldpay is a legit and trusting company.
Worldpay has been accredited by the BBB since the year 2010 and currently has an A+ rating.
Although the company Worldpay has a large number of complaints filed against it, the overall number of complaints is relatively low for a company as large and with as many merchants as Worldpay.
I recommend giving worldpay a try as they are a good company and have treated me just fine.
I've never had any issue with worldpay myself.