Monitoring consultants in the online store

I plan to open a small shop of unique products. “Unique” is the key word. This means that in real time, my admins should tell users about the product, answer questions. ICQ or Skype is not suitable in principle, you need the ability to control consultants! Moreover, I plan to hire freelancers, which means that we will need to keep track of how they communicate with the client and what they write at the beginning in real time.
In short, I set the task for my techies, they did a little research for me, what kind of online consulting systems are and what they can do.

And that's what happened ...

Three systems offer me a choice:

liveoperator.ru 2000 rubles per month for one operator place (test period 14 days)
marva.ru from 900 rubles to 3500 rubles per month for one operator place (test period of 7 days)
rustalk.net 1500 rubles per month for one carrier (test period 30 days)
')
I think now what to choose. Maybe someone dealt with similar tasks? How did you decide? Throw links, write your thoughts. At the same time, check out my techies.

And here is the tablet they made to compare the systems:

	LiveOperator.ru	Marva.ru	Rustalk.net
General features
Online / offline indicator (visitors can see even if there are no operators available)	+	+	+
Multiple parallel conversations in separate windows	+	+	+
Ability to send history to the visitor's e-mail	+	+	+
Change greeting text	+	+	+
Automatic daily, weekly and monthly reports of web traffic support sent to your inbox	-	-	+
Daily, monthly summary of traffic within the client	-	+	+
The ability to create departments and assignment of operators	+	+	+
Support client application for Windows, Mac, Unix.	-	+	+
Spellchecking	+	+	-
Russian language client application	+	+	+
Video and audio chat function	-	-	-
Visitor features
Ability to select a department or operator	+	+	+
Typing Notifications	+	+	+
Callback function, with a request to call back	-	-	+
Sound when new messages appear	+	+	+
Operator photos	+	+	+
The ability to leave a message, even if there are no operators	+	+	+
Evaluation of the operator’s work by visitors	+	+	-
Opportunities of operators
Send files when talking to customers	-	-	+
Block unwanted visitors	+	+	+
Formation of operator response patterns	+	+	+
Ability to create new users with user access rights and operator control	+	+	+
Transfer chat to another operator	+	+	+
Chats between operators, training mode	+	+	+
Information on moving the client through the site	+	+	+
Quick Google search for visitor organization information	-	-	+
Ability to change the background and style	+	-	+
Viewing web analytics reports through the interface web browser	-	-	+
Sound when new visitors appear	+	+	+
Transfer of addresses for automatic opening in the browser window on the side of the visitor	+	-	+
Information from where the visitor came, from which site, by what link	+	+	+
The possibility of initiating a dialogue with any visitor to the site	+	+	+
View and help current administrator conversations	+	-	+
Determining the type of browser, operating system, previous visits and chat sessions	+	+	+
Determination of user geographic location	+	+	+
The function "Active sales" allows you to automatically send messages to all visitors to the site, or a specific group corresponding to a set of parameters.	+	+	-
Collaboration with the browser allows the operator to see the page viewed by the visitor, translate it to the desired page, and even highlight the page fragment.	+	-	-
Support
You can modify the system	-	-	-
Demo - version	+	+	+
Customer support	+	+	+