It's the only VV device I have. I have two of them if that helps you decide. I didn't go with the mini. I got the full size and the 18650 cap. It always fires and it's nice to be able to read the ohms if I am not at my little build space where I keep the multimeter. But like I said I don't have another VV device to compare.
Of the mechs I have - and I have a lot - a Poldiac, a byLeo, couple of Kamrys, a Stingray clone, and an OmeGa: the OmeGa is the best, hits the hardest, and never, ever, ever fails.