I own a couple of these machines, and like to describe them as the poor man's Valentine, not because their performance is sub-par to the grossly overpriced Valentine, but because its design is reminiscent of it - and they're inexpensive to buy. 

Typing performance of the Mexican-made 25 is decent - nothing to write home about, but also nothing to really complain about either - and it's good value if you get one cheap. I'm not a fan of the "messenger" bag; although I really like the idea of it, and how the concept pre-dated laptop bags, it doesn't work well because it's such a tight fit and doesn't provide any real world protection for your machine.

If you like Lettera models and you can get one for a low price, then I'd suggest you buy one. It's a must-have machine for any Olivetti collector, but if your storage space is at a premium and you are looking for a high-quality ultra-portable, I'd look elsewhere. There are far better typewriters in this size that can be had for around the same amount of money.


 

I personally would never spend EUR 45 on a Lettera 25. On average I've been buying them for around $10 CAD, but I could see myself spending up to $40 CAD for one that is in very good condition. As for the Studio models, my average cost has been $45 CAD, but I'm really not a fan of their type action and have sworn off of buying any more of them. 

I think any discussion of other potential models should factor in any budget that you might have, and consider the overall availability of models within your area. There's little point point in my recommending a very expensive machine that abundant in Canada but rare in Europe if you want something inexpensive and easy to get.