Advice on solar telescope

Hi! Having used a white light solar filter on my 70mm Sky-Watcher Mercury refractor, I would really like to observe the sun in H-alpha too but new H-alphascopes is a bit too expensive for me.

Now, I have a chance as a very lightly used Lunt LS40THa B1200 for a bit below €900 - still a bit much for me (would be my biggest astro investment by far), but I could manage it. I understand that the 12mm block filter is bigger than necessary for visual use, and while I might try photography I still expect to be mostly visual.

Does it seem like a reasonable deal? Is the 40 mm Lunt a decent H-alpha scope? It feels like a very small aperture. A max of 80x magnification seems like it might be frustrating, would you all say that's a satisfying power for solar views?