TubeNet

Hi! I have been playing clarinet and bass clarinet for about 8 years and want to learn tuba. However tubas are fairly expensive. I couldn't find any rental options locally but I was able to find a website (musicrentalcentral.com) that offers tuba rentals. My only issue is that they only offer Marinelli instruments. I can't find anything about these instruments either here or anywhere else on the internet. I was wondering if anyone had experience with these instruments and can let me know if I should stay away or not?

Thanks
Rd