Instant Service provides decent number of live support tools. The features set are of the enterprise level. These make Instant Service comparable to Live Person and Velaro services.

Instant Service is a cost effective solution and impressive functionality. A stable service that is easy to use and customize. There is no trial version.

However, Instant Service is a great competitor for Live Person and Velaro and is highly appreciated for the satisfying of user base.
Instant Service provides mass of features such as tabbed interface that is extremely easy to use and an inbuilt browser.

Summary:
Instant Service is a great support solution of the enterprise level. It is a cost effective service.