The air in my lab hummed, a low thrum accompanying the rhythmic tick-tick-tick of the ultrasonic cleaner. Another rebuild. Another flavor chase. The Siren V4 MTL GTA, glinting under the fluorescent lights, sat patiently, awaiting its fate. For a flavor chaser, a true connoisseur of the vape, every atomized puff is a calculated gamble.

This isn’t just about inhaling nicotine; it’s about extracting the very essence of your e-liquid. The Siren series, Digiflavor’s attempt at replicating a classic Kayfun, has always been promising, but the V4 feels different. It’s a noticeable evolution. Digiflavor wisely ditched the odd, internal airflow design of the V2. This one has a straightforward, adjustable airflow, allowing for a tight, restricted draw, ideal for mouth-to-lung (MTL) vaping. It needs that perfect draw.

The build deck, a simple two-post affair, is deceptively accommodating. Plenty of space for a carefully sculpted coil, easily secured. Wicking is a breeze, if you know what you’re doing, which, after years, I do. The key is to avoid overstuffing. Too much cotton and you’ll choke the flavor; too little, and you’ll be wrestling with dry hits. The included airflow inserts are a lovely touch, letting you precisely dial in your preference. I’m telling you, it’s impressive.

The flavor production? Stellar. Crisp, clean, with the ability to distinguish subtle notes in complex e-liquids. I used a simple, classic RY4 blend for this test; the Siren V4 delivered the nuances perfectly. A far cry from some of the more generic MTL RTAs on the market, which can often flatten the profile.

Now, a small caveat. The fill port, located under the top cap, is a little on the small side. Wide-tipped bottles can be a bit of a challenge. Honestly? Just grab a smaller bottle or, you know, use a syringe. It’s hardly a dealbreaker.

Compared to the original Siren, the improvements are significant. The V4 is simply better engineered and provides a superior vape experience. And let’s be honest, it looks better too, the sleek stainless steel finish exudes quality. This is a game-changer for someone like me.

So, who is this RTA for? Serious flavor chasers who appreciate precision and are willing to spend a little time dialing in their builds. It’s a definite buy for anyone upgrading from a stock tank looking to elevate their vaping game. This one’s staying in my rotation. Now, let’s see what this strawberry custard can do… time to rewick.