There really isn't all that much interesting to say about Dhegdheer, it's a simple card that does exactly what it says on the tin: it saves you MU. That, of course, matters mostly with cards that either take up multiple MU (e.g. Magnum Opus) or free MU benefits you (e.g. Deep Data Mining).
When hosting a 2 MU card Dheghdeer is cheaper than two Akamatsu Mem Chips due to the discount on install. When hosting a 1 MU card the two are equally expensive. That's not bad. The mem chips are easier to install with regard to ordering however, you can install a memchip while at 4MU with 3 programs (including a Magnus Opus) installed to gain some free MU but if you want to use Dhegdheer for that same Magnus Opus you have to delay installing it until after installing Dhegdheer.
Because Dhegdheer only hosts a single program it isn't terribly vulnerable to program sniping in the way a Leprechaun with two programs is. Do watch out for Best Defense though if you have a couple of tags, although, let's face it, a sniped program is probably the least of your worries in that scenario.
Like most cards Dhegdheer will not be a common card, but for decks built around the gotta-have-free-MU it's a strong candidate.