I learnt with an i76 and it was fine for that purpose. As soon as you get the hang of it, you'll want something more slippery / better glide / faster, and that's fine. At least then you'll know what you want to do in your more advanced foiling. eg, speed, light wind with big board and sails, waves / freeride, etc.
It good to learn on for how to get in and out of the water, bash on rocks, not slash your legs on sharp tips, etc. I'd have cut my foot off when learning if I was learning with the Patrik foil I use now.