I just recently bought an ID L English on ebay for around that price, and for me personally, I think it was worth it. I've never had a tamagotchi that really had a whole lot of text in it before, and I would like to be able to understand what my tama is saying/doing at all times.
That being said, I also own a Tamagotchi P's, and I am quite fond of it. The navigation is still very easy, so long as you have played a tamagotchi in English previously. There's lots of guides out there for the Japanese color tamas, so figure out your way around it really isn't that bad. Heck, you can even figure it out on your own through trial and error! The games all have instructions online as well, so earning points isn't so bad.
Basically, it comes down to preference. I love being able to understand everything that is going on in my English tamas, but having the language barrier almost makes it more... whimsical? I feel like a kid again, figuring out and discovering new things about my tamas.
90$ is about the average price for an English ID L though, so the one that you saw isn't so bad. Again, it just depends what matters more to you!