We did the Spires trip in January 2015, in via Pokana Bay, out via the Denisons. See trip report here
http://andrewgaskell.weebly.com/bushwalking/january-2015-the-spires, photos here
https://www.flickr.com/photos/118621459@N03/sets/72157650235262755.
Found the going slower than expected along the Pleiades, but I am thinking in hindsight we probably made a strategic error passing most of the rocky outcrops on the rocky western side, rather than going along the eastern side through scrub (interested in knowing how others approached this) - this made for slow going. There was also a cliff line to navigate near the ridge going to Mt Curly - passable but took some time to find a route.
Going up onto Conical Mountain and across to Shining Mt and The Spires no problems.
I have to say we camped at three of the best campsites in Tasmania - Lake Curly, Shining Mt, and Lake Wugata - all stunning (of course there are lots of other 'best' campsites but there you go).
Coming off Conical Mountain back towards Curly requires a bit of care as well.
We didn't have any trouble going out over the Denisons, apart from the small matter of a car parked in the wrong place which extended the last days walking by a large amount of k's!!
In fact prior to the trip we were most concerned about the Lake Curly to Lake Wugata leg but this turned out to be no trouble at all, and probably one of the only days we made the amount of ground we had hoped for.
Of course having the Gordon crossing as the last part of the walk involves some risks re river level - we tried to allow for this by budgeting extra days, etc but in the end we used these up earlier in the trip. We were extremely blessed with our trip timing - out of nine days on the trail we had seven fine. Just after we got back rain bucketed down - the resulting rise in the Gordon's level meant two parties stuck on the Denison side (from memory) had to be airlifted out. We have previously stached food on the Denison side but for a through trip as we did it would mean quite a diversion and extra time to do this.