Having not had a chance to use this outside, I've only been able to set this up on the kitchen table to ensure it connects, which it does. It's fits very nicely into the William Optics 32mm Guide Scope https://www.firstlightoptics.com/guide-cameras/william-optics-32mm-slide-base-uniguide-scope.html . I'll update more as and when I'm able to test the tracking with PHD 2.
But, all in all, this seems like a well made piece of kit, worth the money. Recommended.

Perfect for what I need. It's solid, sensitive and as light as a feather. Thanks again to Chris for his help and expertise.

Bought this to replace another camera which although worked well it just wasn't sensitive enough for guiding with, with 120mm I can get a few stars to lock on to so its worth it's weight in gold to me

Purchased things after many reviews online and the 120mm is everything you want. Quality product, easy to set up and easy to use. The service and delivery time from First Light Optics was its usual high standard.

Arrived the day after ordering - FLO really excelled this time. I was a bit unsure how to set the camera up in INDI since my imaging camera is from ZWO too, but once I'd figured it out, it has worked flawlessly. But most importantly, the images produced are really low noise and it makes for a great guiding camera - PHD2 can pick out multiple stars for the multi-star guiding and I'm getting sub-arc second guiding on my AZ-EQ5GT / SharpStar 15028HNT on the first night out after just a quick calibration. I'll probably look to replace the guide camera on my obsy's EQ6R-Pro with an ASI120MM in the future. The only thing that would improve this camera would be the inclusion of a 1 1/4" parafocal ring so that you keep focus more easily after removing the camera for whatever reason, so I'll be getting one when they are back in stock.

Great guide cam. It's simple and effective! It pairs well with my WO 32mm Uniguide scope.

Achieving focus is easy and can be done using the camera's native app. For first time use, I focused it during the day while holding the guide scope in my hand and read the graduated index on my guide scope. Using that as a beginning point, I was able to fine-tune the focus while mounted during the night. Now for daily use, I have the final reading on the guide scope, so I can quickly set it up.

Application support is great. Besides PHD2, I also use it with SharpCap Pro for polar alignment.

Service from FLO and their delivery partner was amazing. Ordered from India, and received on the 4th day!

Bought as a guide cam to use with my ASI Air Pro and ZWO guidescope which were all bought from FLO.

Great camera and ideal for guiding. Easy to focus with the 30mm guide scope and the additional extenders in the box help with back focus.

The normal great dispatch time and excellent service you get from FLO. Long may it continue and hopefully stock levels of astronomy equipment will get better as time goes on. I’ve been after an HEQ5 pro for a while now.

Got this to build a GuideScope using the default Finder provided by Celestron on a lot of their range,
Not fully setup as yet to use as a proper guider, but a combination of the right adapter and the kit provided by ZWO in the package have already made a better.
As i know have a digital finder by hooking directly up to my phone. Works a treat and you can flip the images so they are the right way up and around etc...
Cant wait to use it properly.

FLO recommended this to us to go with the William Optics 50mm Uniscope as a guide scope. Have been using it for polar aligning in the southern hemisphere and the results have been amazing. Will use it for a guide scope one our main telescope arrives.

The camera was super simple to setup and run though the ZWO supplied software - we had it going in less than five minutes (and we are as new as they come to all this technology). Had no problem connecting it to SharpCap for polar alignment and to APT for taking some photos.

All in all this is a great product being used on a guide scope and for the price it is a simple and cost effective solution - especially for those starting out.

As for FLO - I have been spending months firing questions back and forth about how best for my son to get into astrophography and they have been nothing but amazingly helpful. Order was place and shipped within 24 hours and arrived to New Zealand within two weeks (after being stuck in our customs for a week). Package arrived well wrapped and protected and the experience buying from FLO has just been awesome ... have already placed orders for more equipment with them - keep up the amazing work

I'm planning to use it as a guide cam, but still waiting for the RPI4. The delivery was fast from the UK to Hungary, considering the UK is not EU anymore. When everything is in backorder everywhere in the World, FLO has it anyway!