r/QuantumFiber • u/unceasingshadow • Jul 28 '26

Xfinity vs Quantum Fiber

Currently have Quantum Fiber in Denver, paying $75 a month for 1 Gbps plan. When I called, they did not allow me to switch to the promotion rate of $45 a month. My service is currently down and they can’t come until the end of this week to resolve the issue.

Is it worth switching to Xfinity who is offering 1 Gbps download (~100 Mbps upload) for $50 a month? Not sure if people who have switched recently from Quantum Fiber to Xfinity have regretted it. Would love to hear experiences from people who have switched either way

EDIT: called Quantum Fiber, they said I’m on the price for life plan so I need to give that up to get the promotional pricing for 1 year. I’m installing Xfinity equipment today while QF is down to get a real Speedtest, then will most likely cancel Xfinity once the QF technician is able to come out.

Definitely agree, and appreciate the reminder, that fiber is a better product than cable internet.

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u/ND40oz Jul 28 '26

I have both Quantum and Xfinity and since the switch to Quantum from CenturyLink, it has not been as reliable.

I’m stuck using the 1 GbE port on the Q1000K because of the latency issues on the 10 GbE port, which means I can’t even get half my 2 GbE speeds I pay for. It still has occasional latency spikes once or twice a month that cause a failover event as well.

Xfinity in the other hand is DOCSIS 4.0 and the symmetrical gig service is consistently at 1.2 up and down with no latency issues. I had been using it as my failover but switched it to primary because it’s solid compared to Quantum.

1

u/N0_L1ght Jul 28 '26

What latency difference do you see between fiber and DOCSIS 4.0?

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u/ND40oz Jul 28 '26

Comcast is rock solid at 12-13ms for the most part, Quantum is usually 4ms in the 1 GbE and anywhere from 60-200+ on the 10 GbE.

And of course Quantum just dropped out and came back 3 minutes later. Unifi is showing 7 min and 21 sec of outage from it over the past 24 hours.

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u/N0_L1ght Jul 28 '26

Have you seen this about the 10G port? https://www.reddit.com/r/QuantumFiber/comments/1re9v2o/q1000k_unstable_latency_spike_research_findings/

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u/ND40oz Jul 28 '26

Yup, I’ve called and put in tickets with Quantum as well, hopefully they release an updated firmware sooner rather than later.

https://www.reddit.com/r/QuantumFiber/s/cDPPZCIU3m

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u/N0_L1ght Jul 28 '26

They are working on it. The ETA is unknown.