Installed these modules in the data center for nearly one month. They offered seamless connectivity between cisco switches, helping to set up a stable 40Gbe network. Overall I am happy about my purchase and the way they perform. I will recommend it to others.

I told the sales rep I was urgent to pick up this item when placing the order. Thanks to FS’s timely response, shipping was earlier than I thought. Happy to see these modules came to me in time even during these difficult times.

Never used FS modules before. I was recommended by my friend who has bought from FS.COM many times. It seemed that they have done tests with the QSFP+ module on many cisco switches and many models are available from the description on the web page. After a short conversation with the sales engineer, I got a positive answer about my switch compatibility so I ordered two for tests on MS425. The fact was these modules were decently packaged in fast delivery, compatible with my switches and worked great during a couple of weeks. I was surprised that the sales engineer also sent me an email response to make sure if the product meets my requirement even though I only bought two of them. Very considerate customer service. I was about to buy more from the website and will recommend to others.

Used the QSFP+ on Cisco Meraki MS355-24X. They work nearly the same as my Cisco transceivers but saves me a lot. I’d like to give you 5 stars for your excellent products.

Bought these modules for switches at the customer site. We ran full testing on them to make sure there were no performance issues and they passed all the tests. Good work FS, thanks for saving us a great amount of money without performance sacrifice.

prompt seller , will buy again

WOW, great product for the money. Seems pretty durable. there are no packet errors or interface issues when putting it in our EX4300 switch, Will buy again.

You guys earn our business with great prices and service every time. Recently worked on upgrading our aging 8-site 1 Gbit fiber DWDM ring network to 10GbE. We had tight budgets for this project and so bang for our buck is extremely important to us. I emailed my rep for solutions and products. Things went smooth, he soon offered me a feasible solution with a reasonable budget. We ordered OEO, DWDM Mux/Demux, and other fiber accessories. All products were delivered promptly and accurately with solid packages, no damages at all. Thanks for your helpful remote support, we finally had all the devices and products deployed, no issues so far. These transceiver modules work well on our juniper qfx5100-48s-6q switches which are connected onto the remote juniper qfx10002, and save us a ton of cash from having to purchase the original transceiver modules.
Always a pleasure buying from you guys. You have good prices on the majority of the products we use for our networks, and the Delaware local warehouse & free shipping for orders over $79 is a huge plus compared to your competitor’s tax and shipping costs. Your website and the ordering process are also quick and easy to navigate, and your sales reps have always been helpful, courteous, and professional. Overall, we've been glad to do business with you guys over the years and consider ourselves satisfied customers. All that said, if you would consider providing more convenient tech service, e.g. onsite support, we would be even happier! I just figured it was worth throwing out the suggestion in case my wishes might eventually come true. Regardless, thank you guys for the products and services you provide. Keep up the good work!

As my first purchase on FS.com, the experience is beyond my expectations! I have to say that the guideline of the website is well-designed and user-friendly, which saves me time when I'm looking for what I need. I bought 4 pcs 40G LR4 for our media department. All the modules passed the tests and worked flawlessly with our Cisco switches. I will consider shopping from FS again if needed.

I was looking for some specific Cisco QSFP+ LR4 modules, but most of the dealers could not fulfill the order as early as I expected. So I chose FS and contacted customer service for some detailed info. The sales reps are professional and reliable, I received prompt replies. Then I bought a few of LR4 modules on the website. I could follow my order's logistics at any time, which was satisfying. Besides, my order arrived a little earlier than the agreed time, another huge plus. Nothing wrong with the transceivers. Good-quality products with considerate services. Highly recommend!