Spyder Flash Purple/Blue - Far superior than Zap in quality, feel and function.
Angel IR3 - Ditto
Spyder Flash w/Smart Parts Teardrop and CO2.
Angel IR3 with SmartParts MaxFlo and Total Freak.
Keep it stock and save your money for a higher-end marker. Don't put any money into the Zap.
Excellent accuracy, right out of the box. Very good rate-of-fire. Simple design is easy to break down and reassemble on a bench. It has, basically, a two-stage safety: a legacy safety button and an "On/Off" button. The reason I point this out is because the Spyder Flash uses the ON/Off switch as the safety.
The main reason I feel that this is a poor marker is reliability. This marker shot great when it was initially taken from the box and set up. However, during our first day on the field with it, it suffered leaks, inconsistency, sputtered shooting, double-feeds and chopped balls. I had to break it down and rebuild it to get it working again. It worked fine again, but after about 600 rounds it began to suffer the same failures. I don't think its defective, I think its a poor design. Just my opinion.
Also, the gun feels "cheap" when held. The trigger has an enormous amount of sideways and rearward play. They advertize/emphasize its looks, but I think it looks unrefined.
My opinion is simply that the Spyder Flash is in the same price range and is a much better marker in design, feel, components, quality and reliability. For the same money, I'd recommend the Flash.
Even better, save your upgrade money, skip this price range and buy a Smart Parts Impulse. You get a great marker fitted with a Progressive barrel.