I consider that this piece of equipment does the job it is intended for but with the following reservations:
1. The description 'Stainless Steel Injector' is misleading as the only stainless steel parts are the two 'sharps' and the outer sleeve of the injector's body. All of the remaining elements are of various plastics. These plastic elements include the screw coupling between the body and the needles, the main body of the injector, the plunger and it's screw fitted retainer. Using the description 'stainless steel' implies a level durability that in my opinion is not merited.
Only time and use will tell but I suspect that this item will not survive rigorous use for very long.
2. The unit will not draw up even light liquid in the same way as a medical syringe. Therefore all substances that are to be injected must be loaded into the unit by unscrewing the end retainer and removing the plunger. To perform this fiddly process without making a mess requires a very steady hand or the use of a small funnel.
3. The stainless steel sleeve around the plastic body is a tight but importantly not watertight fit. This means that substances can access this tiny gap between the sleeve and body and being very difficult to clean, it is potentially an ideal breeding place for bacteria. I have now sealed this gap with waterproof silicon but had I recognised the problem earlier, it would have been better to have done this before use. Hopefully those who read this will have now that opportunity.
In short I bought this kit to replace a medical syringe that for many years I had employed for injecting booze into cakes, etc. I hope that I have made a wise purchase but in all honesty I am undecided at present.