I joined about 10 months ago - it was £20(I think for 1 year's membership)
You are able to download all Times puzzles. Some of them can be entered online so you save postage too. (Others - Listener, Mephisto, TLS have to be posted in the usual way)
Each day's puzzles are available immediately after midnight although Mephisto always appears on Sat night around 9pm
I've been lucky and have already won Sat Times Cryptic & 2 mephistos since joining!