Electrical installations are not the place to skimp.Get more than 1 price if unsure, don't be in a rush to pay too much, or pay for inferior work that you may have to rip out and do again.My observations in my local area(s):There are a lot of "Tradesmen" playing the part of contractors.They have no formal schooling, much less actual trade type schooling.Our state requires licenses and certifications, check your local area, become familiar with your rights and you should be fine.my .02

So your lien would be inferior to the code lien.  

I used Redfin's home value tool extensively but they took it away for an inferior automatic estimation.

One last question since we're here: before inferior liens get "wiped out", do they ever get left over proceeds at least from the sale? 

If the interests merge the mortgagee steps into the shoes of the property owner which is inferior to the remaining lien and has foreclosure risk.  

Most are used backwards so that people that have inferior products to sell can make a sale. 

It is best to create AND FOCUS your exhibits on “unseen” items… items discovered only because you actually completed “intrusive inspections” THEN, bring in the “seen” items to make the exhibit longer… if you have time…If you don’t have any unseen items, then you have to work with the best repairs you can find…  and also remember … Your opening paragraph should go into an official state addendum form provided to you by your agent… either you send an email to the agent to tell them the words … (best when the agent is working with you)or you get the blank state addendum form, and put the words in (required when the agent is NOT working with you) .. and your opening paragraph could be something like this:"Due to hazardous Conditions, Code Violations, Unpermitted and Out of Code Improvement, and Structural Defects & Systemic Defects sited in the exhibits below with a total Cost to Cure of $32,700, the Purchase price of the property will be $38,000; the Cost to Cure is evidenced by “Exhibit #5 - Certified, Inspection #0826157538” and “Exhibit #6 - Contractor’ s bids, License #_____________”, and in the following exhibits [found in the attached file name {Forensic Cost to Cure Disclosures Addendum and Exhibits-7538SMarshfield}, attached hereto and an integral part thereof; namely:Exhibit #1 – Code Violation / Hazardous condition - Main service line to Meter & Inferior electrical panel - Cost to Cure : $1,500Exhibit #2 – Structural Defect – Rotting and Failing Fascia & Soffit around 90% of structure – Cost to Cure : $2,700Exhibit #3 – Code Violation / Hazardous condition – Cost to Cure : $1,500Exhibit #4 – Structural Defect – Cost to Cure : UnknownExhibit #5 - Certified, Inspection #0826157538 – 35 pages Exhibit #6 - Contractor’ s bids, License #_____________” – 4 pages,and again ..

Junior lien's claims to equity are inferior to senior liens.

I save a little money having my guys do it but was wondering if we are using an inferior product? 

And if you have to do it (because there is still a market for this as not everyone is connected to the digital world yet) get a website  and drive traffic to your website.To try to convince you to put DMM on the back burner and try more hip methods, I will show you my leads coming in.You will never get this via DMM or all these other inferior methods.