How do IT professionals feel about Teams, one month after its release?

One month after its release, the new collaborative chat application Teams is attracting a lot of attention from IT professionals, who could replace or complement their current communications solution.
A recent study by Spicework shows that 27% of Office 365 users say they want to adopt Teams.
If these figures prove to be correct, this will enable Microsoft Teams to outperform competitors such as Google Hangout and Slack, which hold 16% and 13% of current market share respectively.

One month after its official release, Teams faces a crowded collaborative chat market

Despite the favorable comparisons between Teams and Slack, the collaborative chat market is highly competitive.
Indeed, other major players are present on the market, such as Google Hangout, Facebook’s Workplace, Skype for Business and Atlassian Hipchat.
In an analysis carried out earlier this year, Spiceworks revealed the market position of these major players, placing Skype for Business in first place, Google Hangout in second, Slack in third and Microsoft Teams in fourth:

(This graph represents the use of collaborative chat applications according to company size)
The study also revealed that 17% of IT professionals (Office 365 users or not), intend to adopt Teams within the next two years.
Following these studies, leading Spiceworks analyst Peter Tsai concluded, “Teams will be the second most-used messaging platform in the workplace by 2018, overtaking Google Hangout and Slack, but remaining behind Skype for Business.” Microsoft Teams provides numerous solutions adapted to all types of needs.
Being linked to Office 365, it provides access to all your information, documents, work, presentations and other folders, in a single application.
Skype, on the other hand, offers none of these services.
This offers an economic advantage to companies that often use Office 365 for business management on the one hand, and Slack or Google Hangout for internal communication on the other.
As they are already paying for an Office 365 subscription, what interest would they have in paying for a second application?