Details

Right now, I would not recommend this app. It does NOT work with Case Feeds... yet (See their KB article, however this is contrary to the big banner on the App Exchange page that says it works with the Service Cloud Console). It looks like they could support it after Summer 14. It has been a while since new features have come out, so it is definitely ready for a revamp. 

So, here are the things that it tries to address. 

• Auto creating contact records for contacts that are not in the system yet - good! 
• Saves Attachments separately - good, but there is a free app that does this in a basic way https://appexchange.salesforce.com/listingDetail?listingId=a0N300000016cOVEAY. 
• Canned Comments - but now basically replaced by Quick Text in Case Feeds.
• Update fields as you send email - now much easier in Case Feeds.
• Multiple To: - now a feature in Case Feeds.
• Handles CCs - good.
• Drag and Drop Attachments - now a feature in Case Feeds.
• Email Attachments that are on the case record. This is the Number One reason we used EC2P and it is now in Case Feeds!!! Yay!
• Auto select email templates based on criteria - good. 
• Handles email loops - good. 
• Handles Case Teams - good. 

I have a client that uses this app to great effect, but it is expensive and it is hard to configure, and it has some issues. 

• The email page is clunky and does not present the email in a logical order (To and From fields are down the bottom). 
• Can be confusing between public (emailed to client) and private (on the case) notes. 
• Emails are saved as comments, which is quite confusing. 
• You need to put an email (or Comment) button on the page layout, and there is NO WAY to remove the email button from the Emails related list. For some reason (I can't remember why), we had to retain the emails list on the page. Therefore the "old way" to do emails is still visible, and therefore very very confusing. Even after 2 years of using E2CP, I was again asked by my client to remove the confusing extra button. 

A group of users at my client's site have refused to use this product as they can't see the email as it will be sent out because of the weird way the email page is layed out. Internet Creations can not do an email preview feature. 

I really hope the integration with Case Feeds is really nice and solves some of the major problems of this app, as it has some great features. 

Bottom line is, if you get a lot of support cases in from outside, then try this app. If most of your support cases come from your contacts that are already in the system, battle on with standard email functionality. 

Internet Creations also makes

• Case Flags
• Case Merge Premium
• Case Split
• Change Case Ownership Plus 

Lightning

Sorry, I can't recommend Email to Case Premium for outbound mail in Lightning. It is just not good enough these days to continue to use Comments. There may be very specific instances where this is usable. See Emails in Cases in Lightning for how Outbound Emails can work in Lightning now. 

These are just some notes, but are not fully fleshed out yet. 

(1) HTML Email Reference https://customers.internetcreations.com/KnowledgeDetail?name=HTML-Rich-Text-Support-for-Email-to-Case-Premium