Nice looking Neo. That would be a MVS-4-25 V.3
Here are a couple of tips you want to keep in mind when getting a new MVS.
First, if the EL Panels in the marquee are not lighting up, chances are high that the EL "paper" needs to be replaced. It is very important that if you have any intention of replacing them in the future, that you disconnect the mainboard and power from the marquee light inverter board (which you'll find directly behind the wood marquee housing) until you do. If you listen, you might even hear squealing coming from it. If the bulbs die, the inverter has no place to send its voltage, and this it will eventually kill the inverter if kept running on dead bulbs for too long.
Second, take the case off of the mainboard, and check to make sure that there is no system battery leakage onto the PCB. With a V.3 you probably won't have an issue, but it is always very important to check anyway, as it can cause all sorts of havok with an MVS board.
As far as multicarts go, I don't go anywhere near them (or bootlegs in general), but they are a cost effective option if you just want to play lots of games. The trade-off is that these carts are not made by enthusiasts, but by a still active foreign pirate scene, so the quality of the ROM dumps ranges from decent to dubious. Some of the dumps are sourced from other flawed bootlegged carts, and a some of the "games" listed are hacked variants, so ultimately you get what you pay for.
If you are looking for 100% authentic gameplay from your Neo, make a small list of a handful of titles you want, and keep an eye out for them online. Many of the more popular classic titles are actually quite common in bare cart/gamer's condition form, and can be picked up without causing your wallet to scream in agony.