Bought back in August 2019 (almost a year ago) I can confirm this is a great pump spray that has lasted well and bee used many a time and with a little tweak could get to that 5 star it really deservers (see 'cons' below).
Solid Build - This has been banged around left, right and centrer - from garage, around the garden, to shed and more. No dents and I feel confident when storing liquid within it that it will be safely contained.
Easy to use - I wish I could share more than one video to show the pump action and filling but you will just have to trust me that it is easy to use. Filling is not a problem as with the pumping itself. There is an air valve to release the pressure if required and you just turn and lock in the handle when pumping is complete.
Good coverage from spray - You can tweak the spray to your liking which gives great targeted or wide coverage as you can see in the video. This is epically improtant if you are using chemicals such as weed killer.
Filling guidelines - you can see from the pictures that there are measurement lines on the side which are large and clear to see and which is very important if needing to mix.
Weight and pump lasting time - once filled the weight is actually not that bad at all and the spray time you get out of each pump is more than enough I think - this would depend upon the amount you are spraying out of the nozzle of course and the area to be covered.
Cons - Okay so here is why I gave it 4 stars and although this does not hinder the use it really did annoy me at first so I like to be completely honest in my reviews. The strap. It goes over your shoulder fine and stays there mostly but it is a little annoying and doesn't always hold to the shoulder - shift round to the front or off the shoulder at times. This means that if it gets in the way or otherwise just becomes a little loose it stops you until you sort it again. Also when filling/emptying it can tend to get wet which my read minor but when you are using chemicals you don't want them on your strap that is then going on your clothing etc. I have got used to this now but the design of the strap could be a little better in my opinion = personal choice maybe but just being honest here.
Would I recommended this? Absolutely. It's great for the jobs at hand and a solid product - even with that strap.
Tips - I don't usually give tips in reviews but thought some might find this useful. I wear rubber gloves as it saves you getting chemicals on your hands as the spray particles can spread in the wind. Wear clothing that you don't mind getting 'contaminated' as, again, when spraying you will get some particles landing on clothing. Don't use it in the wind! Wear goggles maybe - depending on what you are spraying.