Well I've been working on the M1. I love the extended bustle rack! Was a pain to build but would be easy with a hold and fold, two straight razors and a pair of tweezers and two MK1 thumbs takes some patience
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Major problems are the same as everyone else has noted:
-the MUST FIX problem with the large, thick moulded 'support' under the forward sponsoon above the roller that must be shaved or removed or the track will not fit. It takes some effort so doing it on an assembled model would be very tough.
-some cleanup on small parts is tedious
-various instruction part # mistakes and lack of clarity for parts placement have you flipping constantly to the paint scheme photos and refferences. The last one I remember was the tail light guards are backwards(U24/25). Other ones are mixed backwards in the COMPONENT build(i.e. 3 of the 4 parts in a given assembly are correct and one is backwards). If I remember one of the parts of the smoke dischargers was wrong for each side. TEST FIT, TEST FIT, TEST FIT. You should be doing it anyway.....
-generally either perfect fit or a handfull of parts have lousy fit(front suspension arm halves and engine cover U13 take some very carefull reworking in particular)....Sanding the angle sharper on the foward edge of U13 got it fit flush. The forward arms (V5/4) should have the locating 'block' shaved off and the round ends of the gas struts (V10/11) should be sanded/thinned by 50% so the halves (V23/24 &V15/16) will mate flush. Main bustle rack mounting brackets(to the rear of the turret) have some fit issues too(N16/17). They can be tweaked to fit so tack glue it and check before comitting. Some are complaining about the main engine cover having issues but I had it friction fitted and taped it on when gluing the hull halves so it worked out ok for me.
-running gear is tough to get lined up, the seemingly agressive locator notches are worthless-keep a ruler handy. Not to bad if you get the front two arms set on the model(don't trust the allignment on the worktable) with a rear arm friction fit for refference. Then friction fit the main arms, check multiple times with a straightedge, and glue from behind..
-another instruction problem-PAY ATTENTION TO ALL DRILL WARNINGS, a couple are out of sequence-check em all off before putting the hull/turret halves together.
-PE is not for the faint of heart, definately not a first timers model
-plastic barrel takes some carefull cleanup and is much better then the metal one. Need to be carefull with allignment of the two main parts.
-mantlet is a poor fit on the top front edge that cleaning up will not fix-fixed with super thin strip styrene. The opening for the mantlet does take a little tweaking/sanding so there will be room for a layer of paint, its way too tight.
-instructions extremely vague on certain components, mainly the headlight assemblies and some turret conduit and hatch details. Also be religious fully checking off all parts numbers as you go along. U18 is a part on the side of the upper hull that almost disappears in the drawings(shown in step 8 ). There is no clear mounting refference for how it fits nor location tabs. It should align flush with the top of the hull so there is a small gap at the bottom to allow for the skirt and pe 'hinges' to clear.
-no additional instructions for mounting accessories such as the spare roadwheels. I will have to wait to see whats left on the sprues.
-be CAREFULL with decals-do NOT trust the instructions, the APU and other stenciling should be checked with refferences, and apparently the kit's "68" is too big with corrected ones provided but not updated on the instructions. Even the markings drawings show the somewhat gigantic ones.
Sounds like a lot, but no more then any huge parts count kit. Still nothing like the average ship model. The great detail of the kit easilly outweighs any minor flaws. Just prefit everything at least 3-4 times and you will be fine. I have only spent about 10 evenings to get to this point. A couple fresh 400/600 sanding sticks with a deft touch make quick work of prepping parts.
In primer for final fit checks:
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The instructions in Dragon kits have had these issues before and it is REDICULOUS that such an essential and easy to redo part of the kit is so overlooked. Its one thing to have the tooling made up or designed with an error, but this is one darn sheet of PAPER. Making an effort to get this right, with multi-part assemblies shown assembled CLEARLY; and a nicer full-color markings sheet(ala Trumpeter) would go a long way for their kits.