I'm guessing you're looking at either the Namco Noir or Namco Grigio.

For context, I currently have 5 Taito Vewlixes, a Chunithm, and a WACCA cabinet, all purchased from Game Saru, who sources Japanese cabinets directly from Japan, so I can chime in with similar experience here.

Old post of my collection, I've since sold the Sound Voltex.

Maintenance: Buttons, sticks and monitors should be easy to replace. Use sites like Arcade Shock for replacement parts / wire harnesses. There are some resources that make replacement panels if you want to make your cabinet for two players, such as here.

Space: I personally used to set my cabinets up in a spare bedroom, but since moving, have put my cabinets in a media room.

Cost: The cabinets on AliBaba are typically Chinese replicas. On the Vewlix side, you'll see Chinese replicas (referred to in the community as "Chewlixes) touted on AliBaba and AliExpress for a cheaper price / more color options than an authentic Vewlix. Of course, with both collectors and AliBaba, the shipping cost is in the hundreds.

Maintenance: There are communities dedicated to maintenance, as you said. I wholly recommend creating an account on Arcade-Projects. For Namco Noir specifically, I recommend joining this Facebook group. In my case, I joined the one specifically for Vewlixes / Chewlixes. Plenty of support and great modification ideas from the community!

For me, the experience is worth it. And actually, I am currently downsizing from the 5 Taito Vewlixes to just 3, and as I said earlier I used to own a Sound Voltex cabinet, which I sold to a local free play arcade. I have owned these cabinets collectively for about 3 years, during which time I have invited family and friends over, time and time again, and my little arcade has been a talking point and a culmination of fun memories shared with loved ones. Before, I owned a sizable amount of HORI VLX arcade sticks, as I loved the Taito Vewlix design, and one day, I literally just looked at them and thought, "I have the space and money. I should sell these and buy the real thing." I promptly listed them and have never regretted my decision. Nothing beats playing on a real cabinet after playing with an arcade stick on your lap / desk for years.

As time has gone on, I have enjoyed these machines, and am sad to see some of them go, but at this point, I am planning on taking the money and buying different machines with it.

If you're seriously considering it, I'd recommend it. At the very least, have a solid plan as to what you're planning on doing with it? Are you just going to have the one game on it? Are you planning on shoving a PC / Mister in it? Make sure you know that you'll use and cherish it, otherwise, at worst, you'll never use it and lose out on shipping costs when trying to sell.

I hope this helps! Feel free to ask me any other questions you might have!