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The writer of these reviews was not aware that the word "however" is an adverb and not a conjunction. This word was used incorrectly in practically every review, e.g., "Excellent value when everything is considered, however purchasers must intend to use all its features to get good ROI."
An example from the net,
and I can recommend the cheap and useful Strunk & White "Elements of Style",
which is an updated version of the below.
William Strunk, Jr. (1869–1946). The Elements of Style. 1918.
V. WORDS AND EXPRESSIONS COMMONLY MISUSED
http://www.bartleby.com/141/strunk3.html
"However. In the meaning nevertheless, not to come first in its sentence or clause.
wrong: The roads were almost impassable. However, we at last succeeded in reaching camp.
correct: The roads were almost impassable. At last, however, we succeeded in reaching camp.
When however comes first, it means in whatever way or to whatever extent.
However you advise him, he will probably do as he thinks best.
However discouraging the prospect, he never lost heart."