I have done about 20 dives with one of these and I am pretty happy with it considering the price.
We've tested the battery capacity on a 70 minute dive at full speed trying to get from point A to B (a distance of about 3km). My partners DPV failed at about 65 minutes and with mine I managed to finish the dive (I'm a bit smaller / lighter). So the specs are pretty accurate on that part.
The DPV is also light weight which I think is a plus for shore diving. Under water they are less "stable" then bigger / longer DPV's but I think it adds to the fun, easy to move around.
Can't comment yet on how they will peform after a longer period of use. Must say that both my partner and I had the same problem with the trigger. There is al little screw for locking the trigger which we both lost somewhere during a dive. No big deal and easy to fix if you're a bit handy. Guess this comes with the price tag
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So far no other complaints. We've had loads of fun with these so far.