I'm not very fond of the leather cases, mainly because they do not provide the solid protection of a hard case and their price is insane.
the PDair case is one of the few hard cases designed to fit the extended battery. and the 15% discount on aximcase.com made it an amazing deal for X30 users.
when I first got the case, I wasn't too impressed because it felt a little bulky. I mean the axim was fat enough with the extended battery, but with the hard case it just got extended even more. other than that the case was excellent and fits the axim perfectly.
there are cutouts for sync cable, headphone jack, etc. and must say the case is very secure once closed. the package comes with beltclip that screws on the back of the case. another very nice add-on.
the surface of the case is very smooth, and very tough. for many times I thought I might have scretched... but turns out... nope! i didn't...

The neoprene lining inside is very smooth and soft. it absorbs shocks and prevent damage to your Axim.
I haven been using it for about 3 weeks and it still looks brand new. so far i dropped the axim 3 times already. yea thats about once every week.

so I'm thankful I have this case.
I give the PDair case a 8/10
For those who use the X30 with extended battery (imo, if you have the X30 then extended battery is a must) this is one of the best cases around. Solid protection again almost anything except water and dust.
And do get it from Aximcases.com while the discount lasts. I'm very impressed about their super fast shipping. only 4 days! and was professionally packaged.