Looking for advice on active monitoring solutions for an ISP network

I work for an ISP in Europe, your typical 4P provider (cable company).

In the last couple of years we've had some outages/problems that weren't visible with passive monitoring tools.

I'm looking into active monitoring solutions in addition to our more traditional SNMP polling.

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In short, I would like:

• Connect probe devices to our P, PE routers and DC gateways (around 150 devices)
• Configure partial or full mesh continuous measurements (mapping on our topology)
• Basic metrics would be: latency, packetloss
• Bonus metrics: video quality, voice quality (MOS), page load speeds (DNS resolving, HTTP performance)
• Alerting via API or SNMP traps
• Provisioning via API
• Easy deployable probes, preferably vendor supported hardware
• We are looking to spend money on this, we need a proper solution with vendor support.
• What I'm not looking for is application monitoring or analytics on our user traffic.

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I've come across these solutions/vendors:

ThousandEyes

Ixia HawkEye

Accedian SkyLIGHT

Netrounds

AppNeta

NetBeez

Uila

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Does someone has some real-life experience with one of above solutions? What is your experience so far?

Or if anyone has other solutions/vendors/insights, I'm eager to learn more...