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Input:
Question: What the difference between Ultrablok and Isoblok2 ?
Document: Assumed from description that the entire case was metal. It is not. The sides and top are plastic. Still doing the job even through an outage when we were not at home. Bought 2. Have one on my sub and one on my power amp. I  Called trip light and they said it was a weight issue since the Ultrablok must hang on the plug prongs. Warranty is the same
Saved my washer a few months ago. The insides of the Ultrablok were badly burned, but the washer worked fine. My guess is a lightning-originated surge was the culprit.Tripplite sent me a new box when I emailed them about the problem. Lifetime warranty.The Ultrablok is relatively heavy and sturdy. If your AC outlet is oriented horizontally, and you plug some heavy industrial power cords into it, it will sag under the strain.
Amazon packaging was solid, this surge protector is weighted fairly heavy and seems very well constructed (thick metal chassis). I hope I never have to deal with a power surge, but for now I have some extra peace of mind. I'm brand loyal to Tripp Lite products in general, and this UltraBlok seems like one of the sturdier products they've put out there.
This is a well-engineered product that does its job. Its internals--chokes, capacitors, and varistors--are chosen to address typical aberrations of power lines, i.e. "noise" and "surges". There are lots of boxes out there that offer the same functionality; what makes the Ultrablok different? Primarily, it is compliance with the latest industry standards. Documents like UL1449 (surge), UL1283 (EMI noise), IEEE 587/C62.41 (waveforms).
this tripp lite ultrablok is well made, manufactured in china....  i am running a home dj system thru these surge protectors... two power amplifiers, pre amp, equalizer, sound processor, cd player, sonic enhancer...  i have not noticed any issues, or problems.... the green lights on front are displayed and lit...  this ultrablok suppressor with two outlets is faily well built with filters to clean up, but not all electrical buzz.
works good so far. We'll see how long my fridge lasts. I stopped losing appliances after installing them on my audio and video gear.
well worth the money to protect modern electronic appliances especially when the power supply is not reliable and has spikes every couple of months. Our appliance failures stopped after installing a couple of these. The green / red LEDs let you know when the power line is not functioning properly.
product appears well built. using the product in a utility room for a washer and dryer. surge protector plugs directly into the outlet, so very easy to use.
great protection for your electronics - I've been using tripp lite for years - quality protection at a great price
all I can say is I hope it works. I bought it because of the reviews but I have not had any power surges as of yet to know if it works, keeping finger crossed
Answer: From what I can see there specs are identical, one is a little smaller than the other.  Here are links to there respective web pages.http://www.tripplite.com/sku/ULTRABLOKhttp://www.tripplite.com/surge-protector-isobar-2-outlets-direct-plug-in-1410-joule~ISOBLOK20/