We did the circuit of the Glyders from the Pen y Gwryd Hotel about a month ago. We went anti-clockwise, descending the route to Pen y Pass, although we cut over the craggy ground south of Llyn Cwmffynnon to get back to Pen y Gwryd rather than Pen y Pass.
We really enjoyed the Pen y Pass part of the route. In descent it had one or two bits of quite interesting route-finding through the craggy, middle third. (There are some intermittent red paint splodges but not always present or easy to spot). I think the route-finding would be easier in ascent, and there's nothing technically difficult (not if you were considering Tryfan) but a few parts are steep enough to be strenuous.
It probably doesn't have the outright grandeur of an ascent through Cwm Idwal and Devil's Kitchen, but it does avoid that awful eroded final climb from LLyn y Cwn. It'll also be a lot quieter. It offers some good views across the Llanberis Pass to Crib Goch and Snowdon, and there's some interesting geology if you're into that at all. As you reach the summit you get good opportunities to clamber among the haphazard shattered rocks, some of which are really spectacular.
If you're doing a circuit then of course you get the traverse past Castell y Gwynt to Glyder Fach, just the same as with an Ogwen ascent. And after the initial clamber down off Glyder Fach towards LLyn Caseg-fraith, the rest of the descent to Pen y Gwryd is straightforward (a bit boggy in its lower section) with the interest more in the views facing you than the terrain itself.
Edited: 04/05/2012 at 21:25