Igodeep:
What the hell, I'll be the odd man out in this one. I prefer low pressure tanks. Many dive shops will not fill a high pressure tank to its full capacity. With most of the low pressure tanks, you are allowed a 10% overfill, plus I like the bouyancy traits of the low pressure fabers. If you now a good tech shop, they may even be comfortable over filling a low pressure faber to over 3000psi (common in cave country).
There are advantages to LP tanks. But overfills such as the ones you describe are not available everywhere... in fact, they're really only widely available in Florida's cave country.
An LP tank can lose it's plus rating, and then you no longer get the full amount. LP tanks are heavier (on land) and larger.
Using an Aluminum 80 for comparison (since they are the most universally familiar), an LP95 (a popular size) is 8" diameter as opposed to 7.25". An HP 100 is the same diameter, but a couple of inches shorter. And even with a 3200 psi fill (only the most craptastic of compressors poop out at this point), you still have 93 cf of gas, compared to the max capacity of 77.4 cf in Aluminum. Just shy of the LP95's rated capacity (of 95 cf), it's true, but it's also a lot smaller tank, and still bring considerably buoyancy advantages over aluminum, and you don't have to overfill it to get that. And the HP100 is lighter on land, as well... same weight as the Al.80 in most cases, and several pounds lighter than the LP95.
So, smaller (shorter and narrower), lighter, nearly the same buoyancy, and nearly the same capacity. Unless you live in cave country, I prefer the HP100. The LP95's are popular tanks also, and for good reason, but I still prefer the HP100s. Also, the hot dip galvanized coating on Worthington tanks handles corrosion from salt water better than Faber's painted tanks. Not a big deal at all when you're diving freshwater caves, but for those of us who mostly dive in salt water, well...
