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Having followed these IMS threads for years, I've come to the view is that there is no unambiguous answer as to which IMSB is the best replacement option.
Given the consequences of an IMSB failure, my criteria is what impacts do the IMSB replacement candidates have on minimizing potential engine damage either during the stages of failure or everyday operations.
If one's goal is to preserve the engine for a long as possible, then price SHOULD NOT be a major factor when deciding. If on the other hand, one wants to keep the engine running for 5 years or less, then any of the options will probably do and price should play a strong role.
And if you're torn between options, then pick the IMSB option that damages the engine the least when it fails regardless of price. Otherwise, you'll still wonder if you made the right decision
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