These goggles are very comfortable and give good vision. However I have been very disappointed to still come out of the pool with dark rings under my eyes which last for hours, especially as there are so many reviews which say they don't cause marks. This was the only reason I bought them.
This is the ideal way to learn Russian (or any other language), especially if you drive around a fair bit and listen while you drive. The pace is excellent as the sympathetic teacher encourages the two learners (one good, the other making a lot of errors) and you learn along with them.
After racing through all 3 books, totally caught up in all the different strands, the last 20 pages or so were a disappointment. There were too many unanswered questions and unresolved issues as well as the unexpected death of a much-loved character. It felt like this was book 3 of 4.