WT+ is clearly better than WT, but you have to put your own value on that amenity: what is is worth to you? Booking in advance, my route RIO-LONDON regularly offers WT at $400 each way and WT+ at $450. Then, when these are sold out, the WT+ price will jump to $600 and $900. Personally (as a short guy, who can sit in a cramped space and jump from the window to the aisle without disturbing other passengers), I don't think WT+ is worth more than double the WT price, but getting it for up to 50% more is, in my opinion, a price worth paying.