For my MX, I had the Xpel precut versions installed and yes if you look close enough (like you're doing) you see the seams. With the precut, they don't wrap over the edges and fold it (as Fusion mentions).
For my M3, I had it done custom by a different installer with Clearguard Nano since at that time, the pre-cut Xpel versions were not available yet. On that installation you do not see any seams or can tell that it has been wrapped. Having said that it, the custom install was more expensive for less coverage area than the MX. The MX was wrapped everywhere (mind you a lot more surface area) vs I did not do the doors for the M3 and it costed about the same.
In the end, I don't look close enough to care one way or another--I am just happy to have the protection given the amount of rocks and debris I deal with on my commute. So far, it has saved me numerous times as the PPF just self heals and my car is back to new.