I like the SIG 551 and they are very good good gel blaster
The gun itself, functions and performs phenominally if a little bit of weight is no issue for the user. One of the best out of the box experiences I have had so far in fact. However, the biggest downside to this gun. Is the battery. The storage compartment this gun makes use of is located in the front of the gun and if I am honest. Poorly sized and fitted. Making it one of the most dreaded parts of owning this particular gel gun. However, of you don't mind being rough with it, or have the know how to create more space in the compartment. Then the one downside to this gun is null and void.
Superb blaster out of the box. Sturdy feel and quality. One of my most reliable blasters.